Question

A car slows down from a speed of 72 km/h to rest in 25 seconds. What is the acceleration of the car in m/s2?

Answer 1

Answer:

Explanation:

SPEED ( m/s) = 72 × 5/18

= 20 m/s

Acceleration = VELOCITY / TIME

= 20 / 25

= 0.8 m/s^2

Answer 2

Answer:

-2.88 m/s2

Explanation:

a= v-u/t

here as the car comes to rest so v(final speed will be zero)

=> a=0-72/25= -72/25= -2.88m/s2