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posted by Anonymous on Monday, September 28, 2009 at 11:14pm.

A car is traveling 20 m/s when the driver sees a child standing on the road. He takes 0.8 s to react, then steps on the brakes and slows at 7.0 m/s2. How far does the car go before it stops?

reaction time = 0.8 seconds at 20 m/s distance = 0.8 s * 20 m/s = 16 m. From v0²-v² = 2aS where v0 and v are initial and final velocities, a, acceleration S, distance travelled braking distance = (0-20²)/(2*(-7 m/s²)) = 40.8 m. Total distance = ?

40.8

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