Question

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

Answer 1

Initial velocity = u = 20

Final velocity = v = 0 m/s as coming to rest .

Time taken in the change= t sec a = -5 m/s² retardation

thus acceleration a =( v-u)/t

⇒- 5 =( 0-20)/t = 4sec