# physics

a car is traveling with a speed of 15 m/s on a stratight horzontal highway. the wheels of the car have a radius of 50cm.if the car then speeds up with an acceleration of 2 m/s for 5s, find the number of revolution of the wheels during this period.

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1. C=2pi*r=6.28*50=314cm/rev = 3.14m/rev.

a = 2 / 5 = 0.4m/s^2.

d = Vo*t + 0.5at^2,
d = 15*5 + 0.5*0.4*5^2,
d = 75 + 5 = 80m.

Rev = 80m / 3.14m/rev = 25.5.

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posted by Henry

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