A car moving to the right at 40 m/s has a mass of 2000 kg. It strikes a car of mass 1500
kg and both cars immediately come to rest. What was the speed and direction of the
second car just prior to the collision?
The Attempt at a Solution
In determining the speed of the second car, I set up my formula to try to resemble what the problem provides in how the first car is moving:
If pinitial=pfinal, then:
I set it up like this since we're only told that the first car is traveling in a given direction towards the second car and we we want it so that we can find v2. So:
(2000 g) (40 m/s) = (1500 g)v2
Otherwise, I'm not sure what approach to take the find the direction. I thought maybe in the x direction with sin equaling 180 degrees with car one in applying the kinetic energy equation but I am not exactly sure if this is correct.