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Answer 1

Answer:

11th

Physics

Work, Energy and Power

Conservation of Energy

A spherical ball of mass 20...

PHYSICS

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Asked on December 20, 2019 by

Serry Dhammi

A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It rolls down a smooth surface to the ground and then climbs up another hill of height 30 m and finally rolls down to a horizontal base at a height 20 m above the ground. The velocity attained by the ball is:

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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

Answer 2

Explanation:

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