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The exercises of physics (kinetic energy theorem) are more troublesome for seniors to help solve.
When the driver reacted, the distance traveled by the car was L = 50/3 * 0.75 =12.5m..

So the remaining distance is the braking distance S = S-L =17.5m..

According to the kinetic energy theorem -fs = mv 1 2/2-mv 2/2

F=uMg again

Get v1= 3.91m/s.

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