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A 50.0-kg boy runs at a speed of 10.0 m/...

A 50.0-kg boy runs at a speed of 10.0 m/s and jumps onto a cart as shown in the figure. The cart is initially at rest. If the speed of the cart with the boy on it is 2.50 m/s, what is the mass of the cart?

A

150 kg

B

175 kg

C

210 kg

D

260 kg

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The correct Answer is:
A
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