Homework Help: Physics

Posted by Josh on Monday, September 19, 2011 at 8:19pm.

A car is traveling 28 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?

Physics - Henry, Tuesday, September 20, 2011 at 8:10pm
d1=Vo*t = 28m/s * 0.8s=22.4m to react.

d2 = (Vf^2 - Vo^2) / 2a,
d2 = (0 - (28)^2) / -14 = 56m,stopping
distance.

D = d1 + d2 = 22.4 + 56 = 78.4m before
stopping.

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