Question

On applying brakes,the speed of a vehicle of mass 200 kg decreases from 72 km/hr to 10 km/hr. Calculate the work done in the process ​

Answer 1

Answer:

hi here is your answer

Explanation:

Given,

Mass of car, M=2000kg

Velocity, V=72×

18

5

=20ms

−1

Apply kinematic equation of motion

v

2

−u

2

=2as

0−20

2

=2a×20

a=−10ms

−2

Breaking force, F=ma=2000×10=20 kN

Apply first kinematic equation

v=u+at

t=

a

v−u

=

−10

0−20

=2 sec

Breaking force is 20 kNand time is 2sec.