A 1000 kg boat traveling at 90km/h when its engine is shut off.
The magnitude of the frictional force fk(newton)=70v(m/s).
Find the time required for the boat to slow to 45 km/h.
何杰睿也不會
卓酸逸也不會
色廣還沒問就說不要問他
一堆同學也不會
老崔則是沒上物理...
誰來解一下
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