Question

A bus running at a speed of 18km/h is stopped in 2.5 seconds by applying brakes. Calculate the retardation produced.

Answer 1

u = 18 km/h  = 10 m/s
v =0 
t = 2.5 sec
v=u+at
⇒0 = 10 + a×2.5
⇒2.5a = -10
⇒a = - 4 m/s²
so, retardation = 4 m/s²