1. The problem statement, all variables and given/known data An airplane flies horizontally with a speed of 300m/s at an altitude of 300m. Assume the ground is level. At what horizontal distance from a target must the pilot release a bomb as to hit the target? Answer: 2.7km 2. Relevant equations a=v/t=d/t2 r_f = r_i + v_i*t + 1/2at2 3. The attempt at a solution I tried approaching this question using a kinematics equation and just the basic a=v/t approach... a=v/t=d/t2 t = sqrt( 2 * d / g ) = 9s d(horizontal) = vt = (300)(9) = 2.7km r_f = r_i + v_i*t + 1/2at2 Using the quadratic equation to find t = 62.5s d(horizontal) = (300)(62.5) = 18.7km Why can I not use the kinematics equation to approach this problem? In general, how do I know whether its appropriate to approach a problem using kinematics vs. the "basic" equations (a=v/t; v=d/t)?