Class 11 NEET Physics Laws of Motion Questions

Components of momentum parallel to the wall add each other and components of momentum in the perpendicular to the wall are opposite to each other. Therefore change of momentum is final momentum - initial momentum
i.e., (mv‌sin‌θ after collision −(−mv‌sin‌θ) before collision
F×t= change in momentum =2mv‌sin‌θ
∴F=

2mv‌sin‌θ

t

=

2×0.5×12×sin‌30°

0.25

=48×

1

2

=24N