Two carts with masses 250. g and 200. g are free to slide without friction on...

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Physics

Two carts with masses 250. g and 200. g are free toslide without friction on a horizontal airtrack.  The 250.gcart is pushed against a spring, compressing it by 3.00 cm, thenreleased.  It slides towards the initially stationary 200 gmass and collides with it.  After the collision the 200. gmass has a forward velocity of 0.450 m/s and the 250. g mass has aforward velocity of 0.250 m/s.
a)  What was the velocity of the 250. g cart just before thecollision?
b)  What was the spring constant?

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