6. Intro to Forces (Dynamics)
Newton's First & Second Laws
4:49 minutes
Problem 4.90
Textbook Question
Textbook QuestionAn 18-kg child is riding in a child-restraint chair, securely fastened to the seat of a car (Fig. 4–69). Assume the car has speed 45 km/h when it hits a tree and is brought to rest in 0.20 s. Assuming constant deceleration during the collision, estimate the net horizontal force F that the straps of the restraint chair exert on the child to hold her in the chair. <IMAGE>
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