Question

A car is travelling in uniform velocity of 70km/h it reduces it's speed to 40km/h in 5 minutes. Find the accleration of the car.

Answer 1

initial velocity:70km/h
70×1000÷3600
final velocity:40km/h
40×1000÷3600
time=5m
5×60s=300s
now,
acceleration= final velocity-initial velocity÷time
a =v-u÷t

Answer 2

acceleration=(final velocity - initial velocity)/time
time=5minutes
=5*60 seconds

=300 seconds


a=(40-70)/300

=-30/300
=-1/10
=-0.1 m/s^2