An automobile is traveling at 35 m/s and is 95 meters from a crash barrier in the road when the driver slams on the brakes. The acceleration is constant. The automobile hits the barrier four seconds after the brakes are applied.

a.) at what velocity was the automobile travling when it struck the barrier?
b.) calculate the automobile's acceleration while the brakes are applied.
c.) assume the same constant acceleration when the brakes are applied. how far away from the barrier should the driver apply the brakes in order that the automobile's velocity is zero as it contacts the barrier?

Question

An automobile is traveling at 35 m/s and is 95 meters from a crash barrier in the road when the driver slams on the brakes. The acceleration is constant. The automobile hits the barrier four seconds after the brakes are applied.

a.) at what velocity was the automobile travling when it struck the barrier?
b.) calculate the automobile's acceleration while the brakes are applied.
c.) assume the same constant acceleration when the brakes are applied. how far away from the barrier should the driver apply the brakes in order that the automobile's velocity is zero as it contacts the barrier?

anonymous · Answer

95 = 35(4) - 1/2 *a *(4)^2