Question

A car travelled at a velocity of 72km/h is brought to rest by applying brakes in 5s . calculate its retardation

Answer 1

Answer:

Explanation:U:20

v=0

v=u+at

0=20+a*5

a=4m/s

Answer 2

Answer:

U = 72 km/hr = 20 m/s

V = 0

t = 5 s

Acceleration = V - U / t

= 0 - 20 / 5

= - 4 m/s²