not sure if i am on the right track, as I am thinking that v is constant at 7.5m/s, height 3.6m, I calculated Kinetic energy horizontally is Ek=0.5mv^2.. or 0.5(4.3)(7.5^2)= 121J, then potential energy Ep=mgh or 4.3(9.8)(3.6)=152 J. so for total E= add all three Ek Ep Efr= so i am off track i think as i don't need Energy or even to use the P=W/T formula. I should be able to get away with v^2=Vin^2+2ad.. which is a= gravity 9.8m/s^2.. so is it just that simple to do V^2=7.5+2(9.8)(3.6)= V^2= sq root of 78.06 which is 8.83m/s is the final velocity as it reaches the bottom.. Total brain cramp... any help would be greatly appreciated.