https://session.master Physics 201 Spring 2016 myct/itemView?assignmentProblemID

Question

https://session.master Physics 201 Spring 2016 myct/itemView?assignmentProblemID-59406550 Hsin Close previous | 2 of 8 I next al for )Problem 8.39 Part A Your ittle sister (mass 25.0 kg) is sitting in her ittle red wagon (mass 8.25 kg ) at rest. You begin puling her forward and continue accelerating her with a constant force for 2.15s, at the end of Calculate the impulse you imparted to the wagon and its passenger Express your answer to three significant figures with the appropriate units which time she's moving at a spoed of 1.80 m/s Jalue Units alfor Submit My Answers Give U Part B With what force dd you pul on the wagon? Express your answer to three significant figures with the appropriate units ed) albr F ale Units Submit My Aeswers Give Up

Explanation / Answer

PArt (A) Impuse = J = Change in momentum = final momentum - initial momentum

J = final momentum - 0 (because starting from rest so initial velocity = 0)

J = m v = (25 + 8.25) x 1.80 = 59.850 kg.m/s

Part (B) Impulse = F.t

So

F.t = 59.85

F = 59.85 / 2.15

F = 27.837 N

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