A body of mass 3 kg hits a wall at an angle of $60^{\circ}$ and returns at the same angle. The impac

Question

A body of mass 3 kg hits a wall at an angle of $60^{\circ}$ and returns at the same angle. The impact time was 0.2 s . The force exerted on the wall\

Professor PC Thomas Classes · Answer

(a) :\ Change in momentum $=m v_{2} \sin 	heta-\left(m v_{1} \sin 	hetaight)=2 m v \sin 	heta$ $$ =2 	imes 3 	imes 10 	imes \sin 60^{\circ}=60 	imes \frac{\sqrt{3}}{2} $$ Force $=$ Change in momentum/Impact time $$ =\frac{30 \sqrt{3}}{0.2}=150 \sqrt{3} \mathrm{~N} $$