1. A ball of mass 0.40kg is moving to the left at a velocity v0=-20 m/s. It is kicked and given a velocity, at 45 degrees upwards to the right, of vf30[/sub] m/s. 1) Find the impulse of the force 2) Find the average force The collision time is 0.010s 2. I = (delta) P I = F (delta)t 3. 1) before p = 0.4x-20= -8 after 30x0.4=12 Change in p = 20Ns Where do the angles some in? 2) F=(delta)P/t=2000 Which is obviously wrong. They didn't include the angles for fun, so there something wrong in my working. Do I have to choose a line to work out the momentum across? ie, linear momentum. A bit confused. Any help appreciated.