Another mechanics question :) (a simpler one, I proimise!) 1. The problem statement, all variables and given/known data http://img223.imageshack.us/img223/5172/112mz7.th.jpg [Broken]http://g.imageshack.us/thpix.php [Broken] As the picture shows: M=4kg V0=5 m/s h=5m F(wind)=2N angle=15 degrees I need to find the distance on axis x of the ball when he hits the ground. 2. The attempt at a solution So this is how I tried to solve it.. 1. I'll try to calculate the distance the ball made untill he got back to the height he started with (the ball goes up a few metters, gets to a point where his speed its 0 and then drops down untill he hits the ground) -Mg - F=Ma -> -40-2=4a -> a=-10.5 m/s2 (right?) y=yo+v0t+0.5at2 0=0+5sin15t+0.5*(-10.5)*t2 -5.25t2+1.3t=0 t=0.247s so to that point the ball made a progress on axis x: X1=v*t=5cos15*0.247=1.19m Now I need to find his progress on axis x from that point, when he got back to the original height he started with and is falling down 5m. The speed on axis y is 5sin15 m/s, so the time it will take the ball to hit the ground from that point is: -5=0-5sin15*t+0.5*(-10.5)*t2 (did I get all the minuses right?:shy:) 5.25t2+1.3t-5=0 t=0.86s so on axis X... X2=v*t=5cos15*0.86=4.15m and alltogher.. X1+X2=5.35m is there any mistake you can tell I made alond the way?