Question

A bus was moving with a speed of 54 km/hours . on applying brakes it stopped in 8 second . calculate the acceleration.

Answer 1

Given u= 54 km/h = 15 m/s v=0 t= 8 s

We know that

v = u - a*t

0= 15-a*8

a= 15/8 = 1.875 m/s*s

Answer 2

v=54 km/h=15 m/s
u=0
t=8 seconds

ATQ
v=u+at
0 = 54 + a*8

Thus a= -15/8= -1.875 m/s^2