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Q1. As part of a safety investigation, two 1200 {rm kg} cars traveling at 24 {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 1.80 {rm s} to stop, and (b) car that hits a concrete barrier and takes 0.4 {rm s} to stop.

Q2. A space traveller whose mass is 115 kg leaves earth. What are his weight and mass on earth and in interplanetary space where there are no nearby planetary objects?

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