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Final Force Needed to Stop

APPH12-QEAJ5K

The motion of a toy car ($m = 2 \space kg$) is illustrated in the force versus time graph shown. Assume the toy car starts at rest at $t = 0$ $s$ and frictional forces are negligible.

Starting at $t = 8$ $s$, the toy car travels for an additional 2 seconds before coming to a stop. What constant force was applied to the toy car during these final 2 seconds?

A

4 N

B

-6 N

C

6 N

D

-4 N