A car traveling at 7.0 m/s accelerates uniformly at 2.5 m/s^2 to reach a speed of 12.0m/s. How long does it take for this acceleration to occur?

1 Answer
Jan 17, 2016

2 seconds

Explanation:

initial speed u=7 ms^-1
Final speed v =12 m s^-1
acceleration (uniform) a=2.5 ms^-2

using First equation of motion

v=u+at

Substituting

12=7+2.5t
12-7=2.5t
5=2.5t
t=2 s