Question

A car is being driven at a speed of 20m/sec when brakes are applied to bring it to rest in 5sec. The declaration produced in this case will be??

Answer is -4 m/sec square

Teacher plz explain the evaluation

Answer 1

In this case,

u (Initial Velocity) = 20 m/sec
v (final velocity) = 0 m/sec (at rest)
time (t) = 5 secs

a = (v-u) /t
a= (0 - 20) / 5

a= -20 / 5

a = -4 m/sec square

Therefore Deceleration produced is 4 m/sec square