Q1 in a head-on collision a car stops in 027 from a speed, Ask an Expert

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Q1. In a head-on collision, a car stops in 0.27 from a speed of 12. The driver has a mass of 76, and is, fortunately, tightly strapped into his seat. What force is applied to the driver by his seat belt during that fraction of a second?

Q2. A dockworker applies a constant horizontal force of 79.0N to a block of ice on a smooth horizontal floor. The frictional force is negligible. The block starts from rest and moves a distance 15m in a time 4.50s. What is the mass?

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