vectors

[vivid agate]

I tried solving this problem but I couldn’t can someone help me

[karmic anvil]

Hopefully this makes sense :)

[vivid agate]

I didn’t get this part what happend?

[karmic anvil]

Since we know the magnitude of the projection is cos theta, to make it a projection, we need to make it into a vector in the direction of a. This means we multiply by the unit vector in that direction, which is just a. Hopefully that makes sense?

[vivid agate]

Yess it makes sense now