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
A
10 m/s
B
m/s
C
40 m/s
D
20 m/s
Text Solution
Verified by ExpertsThe correct answer is:
C
Ball starts from the top of a hill which is 100 m high and finally rolls down to a horizontal base which is 20 m above the ground so from the conservation of energy 
⇒ ⇒ 
.
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