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a car is moving at a constant velocity when it is involved in a collision. the car comes to rest after 0.450s with an average acceleration 90.0 m/ s...

a car is moving at a constant velocity when it is involved in a collision. the car comes to rest after 0.450s with an average acceleration 90.0 m/ s in the direction opposite that the car's velocity.what was the speed in km/ h of the car before collision?

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