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## Homework Statement

A car with a mass of 1200 kg and a speed of 70 km/h collides in a head-on collision with a motorcycle. The vehicles lock together and continue along with the speed of 45 km / h in the cars original direction. The motorcycle weighing 250 kg.

What is the speed of the motorcycle before the collision?

(The masses of both the are included in the weights given)

## Homework Equations

## The Attempt at a Solution

Okay, I'm having a hard time with this one.

I've tried to do something like this:

m= 1200kg

v= 70km/h = 19.4m/s

1200*19.4 = 23280N = 23.3kN

1200*19.4+250*x (why I tried something like this is because I had seen a similar problem being solved along these lines, but on that problem all the information was given, so I thought I could solve this by simply giving the motorcykle the speed of X. However I do not understand this at all, so I thought I'd come here and ask for help to put me into the right direction. I'd like to understand every answer I write and you guys are always to a great help.