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A $50 k g$ boy runs at a speed of $10$ $m / s$ 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 ?

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$260 k g$

$210 k g$

$175 k g$

$150 k g$

answer is A.

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Detailed Solution

$50 (10) + m (0) = (50 + m) (2.5)$

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