A cart with mass 390 g moving on a frictionless linear air track at an initial speed of 0.80 m/s undergoes an elastic collision with an initially stationary cart of unknown mass. After the collision, the first cart continues in its original direction at 0.50 m/s. (a) What is the mass of the second cart

are their multiple choices ?

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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i think they are all correct

explanation:

they seem good

measuring things 1 litre of water