Acar moving at constant speed in a straight line with the engine providing a driving force equal to the resistive force f. when the engine is switched off, the car is brought to rest in a distance of 100 m by the resistive force. it may be assumed that f is constant during the deceleration. the process is then repeated for the same car with the same initial speed but with a constant resistive force of 0.800 f. how far will the car travel while decelerating? a. 120 m b. 125 m c. 156 m d. 250 m

Option (b)

Explanation:

Let the initial speed of the car is u and the final speed is zero. Let mass of the car is m.

Case I

Acceleartion of the car, a = - F/m

Use III equation of motion,

    ...... (1)

Case II

Acceleration of the car, a = - 0.8 F/m

Use III equation of motion,

     ..... (2)

Dividing equation (2) by equation (1), we get

s = 125 m

car stops. he keeps going = he has inertia

report!

explanation:

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