Physics

[mowgly]

Very interesting question there. I'm not 100% sure of my answer but here it is:

First, draw out the diagram. After you finish, draw a line to join the arrows of the two vectors. That is the resultant vector. Next you will need to find the angle such that you can apply the cosine rule formula.

You will get 37 degrees I think.

Hence, the resultant vector is root((6 square) + (2 square) - 2(6)(2)cos37 degrees)) = 4.6 kmh to the power of negative 1. (2 s.f.)

As for direction, you will notice an alternate angle of 13 degrees. Add 13 degrees to 37 degrees and you will get 50 degrees clockwise.

incorrect. there are two angles and two resulting vectors because it's a perfectly elastic collision which means the two balls don't end up together. we can't evaluate the spin of the balls in this problem, have you played pool ... yeah the balls rotates if they aren't hit in the center.

so the only way to see it would be like in this picture


[img=http://img471.imageshack.us/img471/6905/ejercicio1ge4.th.jpg]