Question

calculate the impulse required to stop a car of mass 2000kg moving with a speed 30m/s?​

Answer 1

Answer:

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.

Explanation: