mechanics - KE lost | Mathematics | Page 1

brittle charm May 31, 2024, 9:16 AM

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not sure how to do part b

heavy mistBOT May 31, 2024, 9:16 AM

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brittle charm May 31, 2024, 9:26 AM

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i found the final velocity in terms of v and got that as 4v/9

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but in the mark scheme i dont understand

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this line

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because the angle is alpha/2 anyways right? and why do you need to use cos and sin anyways why cant you use 4v/9

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this is the whole mark scheme

fallen igloo May 31, 2024, 11:05 AM

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brittle charm because the angle is alpha/2 anyways right? and why do you need to use cos and s...

The x component of the velocity is not affected by the wall , so we cannot directly use 4v/9

brittle charm May 31, 2024, 11:09 AM

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fallen igloo The x component of the velocity is not affected by the wall , so we cannot direc...

so the x component is just v?

fallen igloo May 31, 2024, 11:09 AM

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vcos(theta)

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v = vcos(theta) i + v sin(theta) j

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where i and j are unit vectors along x and y

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got it ?

brittle charm May 31, 2024, 11:13 AM

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i think so yeah, thankuu

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.solved

heavy mistBOT May 31, 2024, 11:13 AM

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Solved

Post marked as solved by @brittle charm.

Use .unsolved if this was a mistake.

fallen igloo May 31, 2024, 11:13 AM

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brittle charm i think so yeah, thankuu

welcome :)

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just out of curiosity, are you Indian?

brittle charm May 31, 2024, 11:14 AM

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yess, u?

fallen igloo May 31, 2024, 11:14 AM

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yee

brittle charm May 31, 2024, 11:14 AM

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nicee

fallen igloo May 31, 2024, 11:14 AM

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yeahhh

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you in india ?

brittle charm May 31, 2024, 11:14 AM

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nah, parents from india but i live in UK

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wbu?

fallen igloo May 31, 2024, 11:14 AM

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ohh damm

fallen igloo May 31, 2024, 11:15 AM

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brittle charm wbu?

born in India , still in India

brittle charm May 31, 2024, 11:15 AM

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oh sickk

brittle charm May 31, 2024, 11:48 AM

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can i have help with this too please

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.unsolved

heavy mistBOT May 31, 2024, 11:48 AM

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Unsolved

Post marked as unsolved by @brittle charm.

Use .solved to mark as solved.

brittle charm May 31, 2024, 11:49 AM

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@fallen igloo

fallen igloo May 31, 2024, 11:57 AM

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is the deflected angle measured from the v or x axis ?

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@brittle charm

brittle charm May 31, 2024, 12:01 PM

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from v? like i think its the angle between the two velocities

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so does that mean the i component or the j component would have to be 0

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i think i almost did it right last time ill try again

fallen igloo May 31, 2024, 12:01 PM

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thats what am thinking too

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it goes from 45 to parallel to x axis

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i think i got it

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but i encourage you to try it on your own

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if you dont , tag me , we'll figure it out

brittle charm May 31, 2024, 12:14 PM

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yess i did it too i think i almost had it the time befoer just got confused

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tysm tho!

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.solved

heavy mistBOT May 31, 2024, 12:14 PM

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Solved

Post marked as solved by @brittle charm.

Use .unsolved if this was a mistake.

#mechanics - KE lost