Two carts are on a frictionless, level track. Cart A, on the left side of the track, has a mass mA= 1.25kg, and an initial velocity of vAi= 9.0m/s to the right. Cart B is initially at rest, and on the right side of the track. The carts collide in a perfectly elastic collision. a) Draw a picture of the system before the collision. Include a coordinate system for reference.  b) Write down the equations that represent the conditions that must be met in order to have a perfectly elastic collision. Put the equations in terms of mA, mB, vAi , vAf , vBf .

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