A 2000 kg car travelling at `20 ms^(-1)` hits concret wall and stops in `0.05 s`. What magnitude of impulse did the wall exert on the car ?

Explanation

Given
Mass of the car m=2000 kg
Speed of the car v=20 `ms^(-1)`
Time t= 0.05s
Solution
`a=(v)/(t)=(20)/(0.05)=400 ms^(-2)`
` F=ma implies 2000 xx 400`
`=8xx10^(3) N`
Impulse `=Fxx t implies 8 xx 10^(5) Ns `
The magnitude of impulse exerted by the wall on the car `=4 xx 10^(5) Ns `