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Solved: An 18-kg child is riding in a child-restraint
Chapter 4, Problem 97GP(choose chapter or problem)
An 18-kg child is riding in a child-restraint chair, securely fastened to the seat of a car (Fig. 4–77). Assume the car has speed 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.
Questions & Answers
QUESTION:
An 18-kg child is riding in a child-restraint chair, securely fastened to the seat of a car (Fig. 4–77). Assume the car has speed 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.
ANSWER:
Step 1 of 2
Given:
Mass of the child:
Initial velocity of the car:
Final velocity of the car: 
Time taken for the car to stop:
We know that the force applied is :
Finding the deceleration:
