A car braked with a constant deceleration of 40 ft/s^2 and produced skid marks measuring 160 feet before coming to a stop. How fast was the car traveling when the brakes were first applied?
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v^2 = u^3 -2fs
0 = u^2 -2.40.160
u^2 = 12800
u = 113.14 ft/sec
0 = u^2 -2.40.160
u^2 = 12800
u = 113.14 ft/sec
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30