A spherical ball of mass $20 k g$ is stationary at the top of a hill of height $100 m$ . It rolls down a smooth surface to the ground, then climb up another hill of height $30 m$ and finally rolls down to a horizontal base at height of $20 m$ above the ground. The velocity attended by the ball is (in m/s)

10

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20

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30

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40

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Solution

The correct option is D $40$
Let potential energy be zero at ground and final velocity attained by ball be v.
By conservation of energy,

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A spherical ball of mass 20kg is stationary at the top of a hill of height 100m. It rolls down a smooth surface to the ground, then climb up another hill of height 30m and finally rolls down to a horizontal base at height of 20m above the ground. The velocity attended by the ball is (in m/s)

The correct option is D 40Let potential energy be zero at ground and final velocity attained by ball be v.By conservation of energy,

The correct option is D $40$
Let potential energy be zero at ground and final velocity attained by ball be v.
By conservation of energy,