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A cart of mass m1 = 8.8 kg, moving on frictionless surface with a speed of...

A cart of mass m1 = 8.8 kg, moving on frictionless surface with a speed of 2.5 m/s makes an elastic collision with a cart of unknown mass m2 moving at an unknown speed toward m1 . After the collision, the 8.8 kg cart recoils with a speed of 9.2 m/s as shown in the figure but now m2 is at rest. Find the mass of m2.

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