A 775 -kg car comes to rest from a speed of 75 km/h in a distance of 150 m. Assu

Question

A 775-kg car comes to rest from a speed of 75 km/h in a distance of 150 m. Assume the car is initially moving in the positive direction. Part (a) If the brakes are the only thing making the car come to a stop, calculate the force (in newtons, in a component along the direction of motion of the car) that the brakes apply on the car.
Numeric   : A numeric value is expected and not an expression.
Fb = __________________________________________


Part (b) Suppose instead of braking that the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force, in newtons, exerted on the car in this case.
Numeric   : A numeric value is expected and not an expression.
Fc = __________________________________________


Part (c) What is the ratio of the force on the car from the concrete to the braking force?
Numeric   : A numeric value is expected and not an expression.
Fc/Fb = __________________________________________ A 775-kg car comes to rest from a speed of 75 km/h in a distance of 150 m. Assume the car is initially moving in the positive direction. Part (a) If the brakes are the only thing making the car come to a stop, calculate the force (in newtons, in a component along the direction of motion of the car) that the brakes apply on the car.
Numeric   : A numeric value is expected and not an expression.
Fb = __________________________________________


Part (b) Suppose instead of braking that the car hits a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force, in newtons, exerted on the car in this case.
Numeric   : A numeric value is expected and not an expression.
Fc = __________________________________________


Part (c) What is the ratio of the force on the car from the concrete to the braking force?
Numeric   : A numeric value is expected and not an expression.
Fc/Fb = __________________________________________

Explanation / Answer

given v=0m/s , u= 75 km/hr = 75 *(5/18)m/s s=150m

v

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