Resistive forces?

[sand heron]

I have no clue
2.3 further mech

[vague flume]

for 9)

Inital KE = Work done by resitive force from the vertical wall

=F*d, d= 50 x 10^-3

same thing for 10 but the unkowns are swapped

in reality the force is not constant though
I think it depends on speed or smth

[sand heron]

Why?

[vague flume]

because the force from the wall opposes the motion

and they told you that its constant so it simplifies calculations
but also think about it
it cant just phase through the wall there has to be a force s topping it

[sand heron]

Thank you so much