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Work Power and Energy question

2005 · Shift 0 · Q180
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Work Power and Energy question

2005 · Shift 0 · Q180

JEE MainPhysicsWork Power and EnergyMCQ+4 / −1
A spherical ball of mass 20kg20kg20kg is stationary at the top of a hill of height 100m100m100m. It rolls down a smooth surface to the ground, then climbs up another hill of height 30m30m30m and finally rolls down to a horizontal base at a height of 20m20m20m above the ground. The velocity attained by the ball is
  1. A
    20m/s20m/s20m/s
  2. B
    40m/s40m/s40m/s
  3. C
    1030   m/s10\sqrt {30} \,\,\,m/s1030​m/s
  4. D
    10  m/s10\,\,m/s10m/s
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