How Is Velocity and Impulse Determined in a Two-Car Collision?

[cary5]

1. A car of mass 1500 kg traveling at 20 m/s hits a parked car of mass 2000
kg. The two cars stick together.
a. Find the velocity of the cars after the collision
b. Determine the impulse

i know that the momentom befor the collition is 30,000 how can i use that to find the Vf

 

[yinx]

use conservation of momentum to find the final velocity.

total initial momentum = total final momentum

 

[cary5]

use conservation of momentum to find the final velocity.

total initial momentum = total final momentum

ok so hier is wat i did
Pbefor=Pafte
30,000=3500*Vf
8.57=Vf

and since the change in p is the same befor and after then the change in p would be 0 and therefor the impuls would be 0

m i rite?

 

[yinx]

thats right