A ball of mass 2 kg is raised to the height of 60 m and then dropped from the top- In this case- the quantity which has different magnitude from the other given quantities isA- Velocity just hitting the groundB- Kinetic energy before hitting the groundC- Potential energy at the topD- Work done by gravity

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Energy Transformation

A ball of mas...

Question

A ball of mass 2 kg is raised to the height of 60 m and then dropped from the top. In this case, the quantity which has different magnitude from the other given quantities is

Velocity just hitting the ground

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Kinetic energy before hitting the ground

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Potential energy at the top

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Work done by gravity

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A metal ball of mass 2 kg is allowed to fall freely from rest from a height of 5 m above the ground.

(a) Taking g=10 m $s^{- 2}$ ,calculate:

(i) the potential energy possessed by the ball when it is initially at rest.

(ii) the kinetic energy of the ball just before it hits the ground?

(b) What happens to the mechanical energy after the ball hits the ground and comes to rest?

5 k g

(

g = 10 m / s^{2})

The potential energy of a body at height h is mgh. Then its kinetic energy just before hitting the ground is

10 k g

10 m

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