A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It slides down a smooth surface to the ground, then climbs up another hill of height 30 m and finally slides down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is [AIEEE 2005]

A spherical ball of mass 20 kg is stationary at the top of a hill of h

1.	A spherical ball of mass 20 kg is stationary at the top of a hill of height 100 m. It slides down a smooth surface to the ground, then climbs up another hill of height 30 m and finally slides down to a horizontal base at a height of 20 m above the ground. The velocity attained by the ball is [AIEEE 2005]
A.	10 m/s
B.	\[10\sqrt{30}\]m/s
C.	antacid
D.	20 m/s
Answer» D. 20 m/s

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