t i l e x wrote:The problem with your method using integrals is that v(t) = 4.49 * t + C where C is a constant which we don't know the value of.
I don't quite get what to do here.A propulsion force is opposed to a friction force of 250N. What is the work done by the propulsion force to move a 1000kg car in the following conditions: (a) at constant speed v = 20 m/s for 10s; (b) at constant acceleration from 0 to 20 m/s in 10s; (c) at constant acceleration from 20 to 40 m/s in 10s.
The answer is 5.0 * 10^4 J
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