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Question: on a frictionless tabletop a sphere of mass 30kg and...

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On a frictionless tabletop, a sphere of mass 3.0kg and speed of 20 m/s (the projectile) approaches head on and collides elasticated with a stationary sphere (the target) After the collision, the projectile moves in the opposite direction with a speed of 5.0 m/s. Find out a) the mass of the target b) The velocity of the target after the collision.

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