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A spherical ball of mass 15 kg stationary at the top of a hill of height 82 m. It slides down a smooth surface to the ground, then climbs up another hill of height 32 m and finally slides down to horizontal base at a height of 10 m above the ground. The velocity attained by the ball is

  1. 30 square root of 10 text end text m divided by s    
  2. 10 square root of 30 text end text m divided by s    
  3. 12 square root of 10 text end text m divided by s    
  4. 10 square root of 12 text end text m divided by s    

The correct answer is: 12 square root of 10 text end text m divided by s

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