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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 to29achieve this velocity over 0.2 s when it is hung up?(A) 2 N(B) 4 N(C) 6 N(D) 8 N

Answer»

mass is 60gvelocity is 20 m/shung in air 0.2sso now accelerate a=20/0.2=100F=m*a=100*60=6N



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