Question

a car with a mass of 1.2 × 103 kilograms is moving at a speed of 18 meters/second. It is hit by a truck from behind and its speed after the collision increases to 20 meters/second. What is the value of impulse?

Answer 1

Answer: Value of impulse is
`2.4* 10^3\text{kg m/s}`

Explanation: lmpulse is defined as the amount of force acting over a short time interval 't' which is equal to the change in momentum of the body having mass 'm'.

Mathematically,

`J=F* t=m\Delta v`

And,

`\Delta v=v_2-v_1`

Given:

`m=1.2* 10^3kg\\v_1=18m/s\\v_2=20m/s`

Putting values in above equation, we get:

`J=m(v_2-v_1)=1.2* 10^3(20-18)\text{ kg m/s}`

`J=2.4* 10^3\text{kg m/s}`

Answer 2

2.4 ×
`10^(3)` kilogram meters/ second