A 850-kg car comes to rest from a speed of 92.3 km/h in a distance of 150 m Assu

Question

A 850-kg car comes to rest from a speed of 92.3 km/h in a distance of 150 m Assume the car is initially moving in the positive direction. 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. F_b = ________________ suppose instead of braking that car has a concrete abutment at full speed and is brought to a stop in 2.00 m. Calculate the force, newtons, exerted on the car in this case. What is ratio of the force on the car from the concrete to the braking force?

Explanation / Answer

A) Fb= ma =m(u^2 - v^2)/2s = - 0.5*850*(92.5*5/18)^2 /150

= - 1871 N

B) F = - 0.5*850*(92.5*5/18)^2 /2

= - 140293 N

C) ratio = 140293/1871

=75

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