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## Homework Statement

A car with a mass of 1400 kg is westbound at 50 km/h. It collides at an intersection with a northbound truck having a mass of 2000 kg and travelling at 40 km/h. What is the initial common velocity of the car and truck immediately after the collision if they have an inelastic collision? For this question, a diagram is drawn for you. The mass' stick after colliding[/B]

## Homework Equations

p=mv

## The Attempt at a Solution

So i tried 2 different methods

m1v1+m2v2=mv* and the other method i used was that i drew a triangle (made vectors) found the hypotenuse (momentum combined) and from there i divided by the mass to get the velocity.

When i did this i got 2 different answers im really confused which one is correct please help :)