(10%) Problem 5: A stock car accelerates from rest down a street of length d= 40
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(10%) Problem 5: A stock car accelerates from rest down a street of length d= 400.0 m. In the absence of any friction the stock car has a constant acceleration of a = 29 m/s2 in the direction of motion, and its mass is m-1150 kg. Assume the stock car is moving in the positive horizontal direction 25% Part (a) Assuming there is no rolling friction, write an expression for the amount of net work done on the stock car, we during the run, in terms of the given quantities 25% Part (b) Now consider the existence of rolling friction, which causes a total resistive force with magnitude F, on the stock car Write an expression for the work done by this force over a distance d Grade Summary 5% 95% Attempts remaining: 4 4 5 6 % per attempt) detailed view 5% END SubmitintFeedbackgive up! Hints: 1 % deduction per hint. Hints remaining: 1 Feedback: 1% deduction per feedback.Explanation / Answer
a) Wd = Force *displacement = m*a*d
b) In this case frictional force is opposite to the direction of motion of a body
Work done by the rolling frictional force = W = Fr*d*cos(180) = -Fr*d
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