A spherical ball of mass 20kg is station...

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

`10 ms^(-1)`

`10 sqrt30 ms^(-1)`

`40 ms^(-1)`

`20 ms^(-1)`

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