A spherical ball of mass 20 kg is stationary on the top of a hill of height 100 m. If rolls down a smooth surface to the horizontal bases at a height of 20 m above the ground….

Q: A spherical ball of mass 20 kg is stationary on the top of a hill of height 100 m. If rolls down a smooth surface to the horizontal bases at a height of 20 m above the ground. The velocity attained by the ball is

(a) 40 m/s

(b) 20 m/s

(c) 10 m/s

(d) 10√30 m/s

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Ans: (a)