- #1

MooPhysics

## Homework Statement

A car initially at rest accelerates North for 10seconds. At 11seconds a second car heading west at (Time given in Km/h) collides with the first car at a cross intersection. The cars stick together and slide off across the intersection at (Vf given in KM/h). How much energy was transformed into heat? What is the Impulse of the first cars engine?

Mass of Car1 (Given in kg) (m1)

Mass of Car2 (Given in kg) (m2)

Velocity of Car 2 (v2)

## Homework Equations

m1v1=(m1+m2)v2

I=p (Change in momentum p)

p= m*v (Change in Velocity)

F*t=m*v3. Attempt

My question is: How do I figure out the velocity of the first car? I have tried v1=(m1+m2)v2/m1 but I am unsure if I am on the right track due to the car1 accelerating. Would the initial velocity for Car1 be vi=0 due to the car starting off at rest? I can't seem to work out the acceleration due to not having the distance given to me. Is there a formula I may have not considered here? I have a feeling I need to work backwards, but not sure where to start.

When the question asks about energy to heat, is it talking about Kinetic Energy. I thought some of the energy would have been absorbed do to the collision?