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A cart is released from rest at the top of a long ramp at time $t=0$ seconds and moves down the ramp at a constant acceleration rate. At a time of $t$, the cart has reached a speed of $2 \text{ m/s}$.

How fast will the cart be moving at the time of $3t$?

A

$3 \text{ m/s}$

B

$6 \text{ m/s}$

C

$12 \text{ m/s}$

D

$18 \text{ m/s}$

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