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A car traveling 55.0 km/h is 21.8m from a barrier when the driver slams on the brakes. The car hits the barrier 2.46s later. (a)

A car traveling 55.0 km/h is 21.8m from a barrier when the driver slams on the brakes. The car hits the barrier 2.46s later. (a) What is the car's constant deceleration magnitude before impact? (b) How fast is the car traveling at impact?

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