Two boxes hit together and stick in a perfectly inelastic collision. If the first box had a mass of 7kg and was going 2 m/s and the second box was 5kg and going -8m/s, what was their combined velocity after the collision?

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Explanation:

we need some answer choices, or something like that

explanation:

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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