3. A man claims that he can hold onto a 12.0-kg child in a head-on collision as long as he has his seat belt on. Consider this man in a collision in which he is in one of two identical cars each traveling toward the
other at 60.0 mi/h relative to the ground. The car in which he rides is brought to rest in 0.10 s. (a) Find
the magnitude of the average force needed to hold onto the child. (b) Based on your result to part (a),
is the man’s claim valid? (c) What does the answer to this problem say about laws requiring the use of
proper safety devices such as seat belts and special toddler seats?