Homework Help: physics

Posted by Elise on Wednesday, February 2, 2011 at 9:25pm.

A car is moving along with a velocity of 88ft/sec and has a weight of 2000lbs. The engine suddenly stops. If the coefficient of frictgion between the car and road is .2.(a) Find the acceleration. (b) How long will it take to come to rest? (c) How far will it travel before it stops?

physics - drwls, Thursday, February 3, 2011 at 2:10am
88 ft/s = 60 mph

(a) Deceleration rate = M*g*0.2/M
= 17.6 ft/s^2

(b) T*17.6 ft/s^2 = 88 ft/s
T = 5.0 s

(c) X = average speed * T = (88/2)*5
= 220 feet

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