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A ball of mass 0.2 kg is dropped from a height of 10 m. How much mechanical energy does it have right before it hits the ground? (Assume there is no air resistance.) Acceleration due to gravity is g 9.8 m/s2.

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A ball of mass 02 kg is dropped from a height of 10 m How much mechanical energy does it have right before it hits the ground Assume there is no air resistance class=

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Answer:

19.6 J  

Step-by-step explanation:

Before the ball is dropped, it has a potential energy

PE = mgh

PE = 0.2 × 10 × 9.8

PE = 19.6 J

Just before the ball hits the ground, the potential energy has been converted into kinetic (mechanical) energy.

KE = 19.6 J

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