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19. A tennis ball of mass 60 g is thrown up with a velocity of 20 m s What force is exerted on this ball toachieve this velocity over 0.2 s when it is hung up?(A) 2 N(B) 4 N(C) 6 N(D) 8 N

Answer»

f=maa=20/0.2a=100m/s²f=0.06*100=6N

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