Farouk

if 2500 is invested at an interest rate of 6.5% compounded monthly how long will it take for the investment to reach 7500

At 4.2 [m], it loses 60% of its initial speed, u. This means that at 4.2 [m], the speed, v = u - 0.6u. So, by using v^2 = u^2 - 2gs, assume g = 9.81 [m/s^2], s = 4.2 [m] (u - 0.6u)^2 = u^2 - 2gs u = 9.9045 [m/s], this is the initial speed. Then, at the ma...

it helped :D