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A boy and sled have a combined mass of $50\text{ kg}$. They are sliding across a frictionless horizontal frozen pond, at a speed of $10\ \text{ m/s}$.

Which of the following indicates how much kinetic energy they possess?

A

$250\text{ J}$

B

$500\text{ J}$

C

$2500\text{ J}$

D

$5000\text{ J}$

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