A ball of mass m collides with a wall with speed u and rebounds with the same speed. If the mass of the wall is infinite, then work done by the ball on the wall is

Q: A ball of mass m collides with a wall with speed u and rebounds with the same speed. If the mass of the wall is infinite, then work done by the ball on the wall is

(a) mu

(b) (1/2) m u2

(c) zero

(d) 2 m u2

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Ans: (c)