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


( A ) 40 m/s
( B ) $10 \sqrt{30}$ m/s
( C ) 20 m/s
( D ) 10 m/s

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