Question

If a bus travelling at 20 m/s is subjected to a steady deceleration of 5 m/s2, how long will it take to come to rest ?

Answer 1

Deceleration, a=$-5m/s^2$

Initial velocity, u=$20m/s$

Final velocity, v=$0m/s$

t=?

Using the equation:

$t=\frac{v-u}{a}$

$t=\frac{0-20}{-5}$

$t=4s$