Question

As part of a safety investigation, two 1900 kg cars traveling at 20 m/s are crashed into different barriers. Part A Find the average force exerted on the car that hits a line of water barrels and takes 1.3 s to stop.

Answer 1

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`29.2* 10^(3) N`

Step-by-step explanation:

We are given that

Mass of cars= m=1900 kg

Initial speed of car=u=20 m/s

Final speed of car=v=0

Time=
`\Delta t`=1.3 s

We have to find the average force exerted on the car.

Average force=
`(change\;in\;momentum)/(\Delta t)`

`F_(avg)=(mv-mu)/(1.3)`

`F_(avg)=(1900(0)-1900(20))/(1.3)`

`F_(avg)=(-38000)/(1.3)=-29.2* 10^(3) N`

Hence, the average force exerted on the car that hits a line of water barrels=-
`29.2* 10^(3) N`