First slide
Work
Question

A cricket ball of mass 0.15 kg is thrown vertically up by a bowling machine so that it rises to a maximum height of 20 m after leaving the machine. If the part pushing the ball applies a constant force F on the ball and moves horizontally a distance of 0.2 m while launching the ball, the value of F (in N) is g=10  ms2 ______ 

Easy
Solution

Work energy theorem  F0.2=0.15×10×20 F=150N

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