Question

Juliette is driving her car when she sees a cat run across the road. If she is able to stop the car over a distance of 0.025km in 2.5 s, what is her average acceleration?
A. +10 m/s2
B. +0.01 m/s2
C. -0.004 m/s2
D. -4 m/s2

Answer 1

$velocity=\frac{distance}{time}=\frac{0,025km}{2,5s}=\frac{25m}{2,5s}=100\frac{m}{s}\\\\ acceleration=\frac{velocity}{time}=\frac{-10\frac{m}{s}}{2,5s}=-4\frac{m}{s^2}\\\\Solution\ is\ D.$