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JEE Main Physics question

PhysicsWork, Energy and PowerJEE Main

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, Similar AIIMS 2007]

Answer: (C)

Solution

Since all surfaces are smooth, total mechanical energy is conserved throughout. The net height

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Question ID VK-153958