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I just want to ask you guys a problem I had at the very beginning of grade 10th. I am going to go to grade 11th next year. But I still cannot figure this out. (So it's obviously not homework). Any help will be highly appreciated.

A canoe (mass 0.5kg) has an initial velocity of 10 m/s. As it moves along the river, a force F = 0.5v acts on it (to make it decelerate). Calculate the distance the canoe will go when:

a/ Its velocity is 5 m/s.

b/ The canoe stops.

(I'm sorry if my translation of the problem is not clear).

The book gives the answer for a is 5m, and b is 10m.

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So what I have so far is a = -v. And I know that to calculate the distance, I must have a function v with respect to t. But... how can I have it?

Thanks a lot.

Viet Dao,