1. The problem statement, all variables and given/known data Quarterback Fred is going to throw a pass to tight end Doug. Doug is 20 m in front of Fred and running straight away at 6.0 m/s when Fred throws the 500 g football at a 40 angle. Doug catches the ball without having to alter his speed and runs for the game-winning pass. How fast did Fred throw the ball? 2. Relevant equations Perhaps kinematics equations? 3. The attempt at a solution I've been working on this one for about an hour and still can't seem to solve it. I've tried using the usual big three kinematics equations substiting all over the place, but I've missed the problem 4 times so far as I can't get the correct answer. I am guessing the 500g football doesn't matter in this problem? Any ideas on this? Is it relative motion? I am completely stumped.