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Q1. As part of a safety investigation, two 1900 {rm kg} cars travelling at 19 {rm m/s} are crashed into different barriers. Find the average forces exerted on (a) car that hits a line of water barrels and takes 1.8 {rm s} to stop, and (b) car that hits a concrete barrier and takes 0.1 {rm s} to stop.

What are F1 and F2? Use two significant figures.

Q2. How much power is needed to push a 99 chest at 0.79 along a horizontal floor where the coefficient of friction is 0.75?

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