A spherical ball of mass 20kg is stationary at the top of a hill of he – McqOptions

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1.	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 climbs up another hill of height 30m and finally rolls done to a horizontal base at a height of 20m above the ground. The velocity attained by the ball is ___________
A.	10m/s
B.	10 30m/s
C.	40m/s
D.	20m/s
Answer» D. 20m/s

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