Homework Help: physics

Posted by zoey on Sunday, August 28, 2011 at 3:33pm.

At highway speeds, a particular automobile is capable of an acceleration of about 1.6 m/s2. At this rate, how long does it take to accelerate from 81 km/h to 117 km/h?

physics - Henry, Tuesday, August 30, 2011 at 10:59am
Vo = 81000m/h * (1/3600)h/s = 22.5m/s.

Vf = 117000m/h * (1/3600)h/s = 32.5m/s.

Vf = Vo + at,
t = (Vf-Vo) / a
t = (32.5 - 22.5)/ 1.6 = 6.25s.

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