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A soccer ball is traveling at a velocity of 50 m/s. The kinetic energy of the ball is 500 J. What is the mass of the soccer ball? (Formula: ) A 0.1 kg B 0.2 kg C 0.4 kg D 0.5 kg

Answer»

v=30 m/s t=0.1 s m=0.25kgThe BALL bounces back with same SPEED after hitting the wall. Thus change in its momentum ΔP=mv−(−mv)=2mv=2×0.25×30=15 kg.m/sUsing ΔP=∣F∣t∴ 15=∣F∣×0.1 ⟹∣F∣=150 NThus the force EXERTED by the wall on the ball F=−150 N



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