Question

NCERT CLASS IX - Science Textbook
Chapter 8 - Motion

A bus decreases its speed from 80 km h - '1to 60 km h - '1in 5 s. Find the acceleration of the bus.

Answer 1

Its actually deacceleration.

Acceleration= change in velocity/time(a=v1-v2/t)

80kmph=22.2m/s and 60 kmph= 16.6 m/s

a=(16.6-22.2)/5[Because velocity is dereasing]
a= -1.12 m/s^2.