Question

The velocity of a ball of mass 20kg at the instant is 10m/s .It's KE is
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Answer 1

Answer:

For the potential energy, only the difference between the initial and final points count.

So this difference is 100−20=80 m

Conservation of energy

2

1

mv

2

=mgh

0.5v

2

=10×80

⇒v=40 m/s