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A 550 g
cart is released from rest on a frictionless, 30 ∘
ramp, 120 cm
from the bottom of the ramp. It rolls down, bounces off a rubber block at the bottom, and then rolls 80 cm
back up the ramp. A high-speed video shows that the cart was in contact with the rubber block for 25 ms
.
What was the magnitude of the average force exerted on the cart by the block?



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