A ball moving with a velocity u strikes a wall moving toward the ball with a velocity u. An elastic impact lasts for t sec. Then the mean elastic force acting on the ball is

A ball moving with a velocity u strikes a wall moving toward the ball

1.	A ball moving with a velocity u strikes a wall moving toward the ball with a velocity u. An elastic impact lasts for t sec. Then the mean elastic force acting on the ball is
A.	\[\frac{2m\upsilon }{t}\]
B.	\[\frac{2m(\upsilon +u)}{t}\]
C.	\[\frac{2m(\upsilon +2u)}{t}\]
D.	\[\frac{m(\upsilon +2u)}{t}\]
Answer» C. \[\frac{2m(\upsilon +2u)}{t}\]

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A ball moving with a velocity u strikes a wall moving toward the ball with a velocity u. An elastic impact lasts for t sec. Then the mean elastic force acting on the ball is

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