A $300-kg$ flatcar $20$ m long is moving with a speed of $7\mathrm{.}0\frac{m}{s}$ along horizontal frictionless rails. A $90-kg$ worker starts walking from one end of the car to the other in the direction of motion, with speed $3\mathrm{.}0\frac{m}{s}$ with respect to the car.

Part A

In the time it takes for him to reach the other end, how far has the flatcar moved?

Express your answer using two significant figures.

$d=$

$$

$m$

$$

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