80-kg object is constrained to move along a straight line. Its initial speed is

Question

80-kg object is constrained to move along a straight line. Its initial speed is 12.0 m/s in one direction, and its final speed is 8.00 m/s in the opposite direction. Complete the graph of force versus time with appropriate values for both variables in the figure below. Assume each tick mark on the time axis is 1 s. What is the time tf. (Express your answer as integer.) 8 s Calculate the value for F1. (Express your answer to three significant figures.) N Calculate the value for F2. (Express your answer to three significant figures.) N Calculate the value for F3. (Express your answer to three significant figures.) N

Explanation / Answer

I consider each tick mark on the force axis are equal to

F = P / t = [ m |v| ] / t = [ 6.80 Kg * | 8 m/s -12 m/s | ] / ( 8s ) = 3.4 N

2) F1 = 4 F = 4 * 3.4 N = 13.6 N

3) F2 = 2 F = 2 * 3.4 N = 6.8 N

4) F3 = 1 F = 1 * 3.4 N = 3.4 N

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