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 45 km/h when it hits a tree and is brought to rest in 0.20 s. Assuming constant deceleration during the colli- sion, estimate the net horizontal force F that the straps of the restraint chair exert on the child FIGURE 4–77 to hold her in the chair. Problem 97.

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Chapter1: Units, Trigonometry. And Vectors
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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 45 km/h when it hits
a tree and is brought to rest
in 0.20 s. Assuming constant
deceleration during the colli-
sion, estimate the net horizontal
force F that the straps of the
restraint chair exert on the child
FIGURE 4–77
to hold her in the chair.
Problem 97.
Transcribed Image Text: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 45 km/h when it hits a tree and is brought to rest in 0.20 s. Assuming constant deceleration during the colli- sion, estimate the net horizontal force F that the straps of the restraint chair exert on the child FIGURE 4–77 to hold her in the chair. Problem 97.
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