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Two bodies m2 and m3 of mass 1 kg are initially at rest at the positions...

Two bodies m2 and m3 of mass 1 kg are initially at rest at the positions x2 = 0 and x3 = 1 m, respectively. At time t = 0, another body M of mass 3 m, and moving in the direction of the X axis with velocity v = 1 m/s, collides elastically with the body located at the origin.
a) What will be the velocities of the bodies after the first collision?
b) What will be the speeds of the 3 bodies for t > 2 s if the second collision is also elastic?

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