A 400g ball falls through 5m from rest. 1.0kg weighs 10N. Calculate its gain of k.e..

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A 400g ball falls through 5m from rest. 1.0kg weighs 10N. Calculate its gain of k.e..

[From: ] [author: ] [Date: 12-04-14] [Hit: ]

Gravity did 20 J of work on the ball, so the ball gains 20 J of kinetic energy.......

I would be very grateful if you could help me>

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The 400g (0.4kg) ball is 4/10 of 1.0kg, so it weighs 4N.

Gravity exerts 4N of force on the ball through a distance of 5m.
Work = Force * Displacement
Work = 4N * 5m
Work = 20 J

Gravity did 20 J of work on the ball, so the ball gains 20 J of kinetic energy.

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