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What force is required to slow a 1250-kg car traveling 115 km/h to 30.0 km/h within...

What force is required to slow a 1250-kg car traveling 115 km/h to 30.0 km/h within 3.50 s? (a) How far does the car travel during its deceleration? (b) How long does it take for the car to come to a complete stop at this same rate of deceleration?
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