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A 3.0 kg mass is moving at 7.0 m/s on a frictionless flat surface and it...

A 3.0 kg mass is moving at 7.0 m/s on a frictionless flat surface and it collides and sticks to a stationary 7.0 kg mass. The larger mass is attached to a light spring of force constant 200 N/m

1. construct an equation of motion for the following with t=0 representing the moment immediately after the collision at x=0: x(t) and v(t)

2. Sketch x(t) and v(t) as a function of time.

confused and would like help please, thanks!

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