The following graph represents the speed of a car as a function of time. We know that as the car...

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The following graph represents the speed of a car as a function of time. We know that as the car speeds up there is a friction force with air that can be approximately considered to be proportional to the speed of the car. Which of the following graphs can be the force of the engine as a function of time?
(1)
(2)
(3)
(4)
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