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A driver in a car sees a deer run out into the road and puts on the brakes. Unfortunately the car hits the deer. Explain why it is much more likely that

the deer will be severely injured if the car was travelling at 40 miles per hour than if it was travelling at 30 miles per hour.


The time needed for the 40mph car to stop is shorter compared to the other car.  Also the distance is shorter thus the force the deer will receive is greater compared to a car travelling at 30mph which has somehow longer stopping time and greater distance.

It's very hard to stop a speeding object from moving. It will require a lot of force to put it in a complete halt.
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