Question

A car starts from rest and attain a velocity of 18km/h in 2s. find its accelaration in si unit

Answer 1

first change velocity into m/s

so 18km/hr=5m/s

using v=u+at we get

5=0+a(2)

a=2.5m/s^2

Answer 2

Initial velocity of the car, u = 0
Final velocity of the car, v = 18km/h
= 18*5/18 m/s
= 5m/s
Time = 2s
Acceleration = 5-0/2
= 5/2
= 2.5 ms^-2