As part of a safety investigation, two 1600 cars traveling at 18 are crashed into different barriers. Find the average forces exerted on (a) the car that hits a line of water barrels and takes 1.8 to stop, and (b) the car that hits a concrete barrier and takes 0.4 to stop.

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- I am getting 605. But answer states 863. p=0.10, z=1.64 and E=0.02, q=0.90 Used Formula - (1.64/0.02)^2*0.10*0.90