Question

When Maggie applies the brakes of her car, the car slows uniformly from 15.3 m/s to 0 m/s in 2.23 s. How far ahead of a stop sign must she apply her brakes in order to stop at the sign? Answer in units of m

Answer 1

Answer:

The answer is 34.119m

Explanation:

You need to pay attention to the word "uniformly". It means there is no acceleration thus the physics of this problem respond to the uniform rectilinear motion equations:

• Xf = Xo + vt
• v = constant
• a = 0

where:

• Xf = Final position

• Xo = Origin position

• v = velocity (speed)
• t = time
• a = acceleration

Xf = 0 + (15.3)(2.23)

Xf = 34.119m