Question

A car moving with 20m/s is brought to rest by applying brakes in 5sec. Calculate retardation

Answer 1

Answer:

Retardation = 4 m/s

Explanation:

time taken = 5 s(t)

initial velocity = 20 m/s(u)

final velocity = 0(rest)(v)

v=u+at

0=20+a*5

-20=5*a

a= -4 m/s

acceleration is negative as it is retardation