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a boy was sitting on a bench until a ball of mass 40kg and speed...

a boy was sitting on a bench until a ball of mass 40kg and speed of 30m/s coming from a height of 150.5m striked the boy of mass 90kg who was sitting on a bench of 60m calculate the energy the boy used? (g=10m/s²).
A.18KJ
B.18000J
C.20200J
D.40500J
E.54000J?

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