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

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

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The following parts can be solved as follows:-

genius_generous answered 2 months ago

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