Two cars colliding at intersection - find velocity of wreckage

[skatecash]

A 1100 kg car traveling north (+j) at 70 km/h collides at an intersection with a 2000 kg car traveling west (-i) at 48 km/h. The two cars stick together.
Find the magnitude and direction of the velocity of the wreckage just after the collision

I did pythag. thereom and got 84.9, but it wrong??

 

[G01]

I am not getting the same answer as you, but I agree that the problem is basically just the Pythagorean Theorem. Check you math again. Do you know what the correct answer is?