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## Homework Statement

You are moving due North in your car with velocity (0, 20m/s). You see another car travelling with a relative velocity of 15 m/s with an angle of 150 degrees. You have a mass of 30 kg, the other tricyclist has a mass of 40kg and the tricycles both have mass 10kg. You collide and stick together.

a) What is your velocity right after the collision?

b) Just after the collision, at what angle are you moving with respect to the x-axis?

c) What is your speed after the collision?

d) What is your change in kinetic energy from the collision?

## Homework Equations

Vac = Vab + Vbc

m1v1 = (m1 + m2) v2

tan-1 = Vy/ Vx

pythagorean theorem

## The Attempt at a Solution

First I would use the relative velocity equation to find the velocity of car 2 with respect to the ground. I'm not sure how to set this up though. Then I would use the x and y components to solve for the angle. After, I would use these two values and plug them into the pythagorean theorem. Finally, I can't seem to figure out what the equation is for change in kinetic energy!!

Any help from you guys would be greatly appreciated! I'm really stuck here :(