EK1001 #429 impulse question

[SSerenity]

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If average force = m*dV

The area under the curve from 0-10 and 10-20 are the same. Mass does not change, so why is D incorrect? I agree that C is also correct.

Thanks!

 

[Triveal]

When force is positive, the mass is accelerating. So each second between 0 and 20, it's going faster than the second before it. So average velocity (and thus distance travelled) is higher for 10-20 than it is for 0-10.