# Mechanics (momentum)

A flatcar of mass $$M$$ starts moving to the right due to a constant force $$F$$. Sand spills on the car from a stationary hopper. The velocity of loading is constant and equal to $$n$$. Find the velocity at time $$t$$.

Details and Assumptions:

• $$n=5kgs^{-1}$$
• $$t=2s$$
• $$F=10N$$
• $$M=2kg$$
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