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Introductory Physics Homework Help
Kinematics of a falling object to hit target
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[QUOTE="vetgirl1990, post: 5292453, member: 573977"] [h2]Homework Statement [/h2] 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 [h2]Homework Equations[/h2] a=v/t=d/t[SUP]2[/SUP] r_f = r_i + v_i*t + 1/2at[SUP]2[/SUP] [h2]The Attempt at a Solution[/h2] I tried approaching this question using a kinematics equation and just the basic a=v/t approach... a=v/t=d/t[SUP]2[/SUP] t = sqrt( 2 * d / g ) = 9s d(horizontal) = vt = (300)(9) = 2.7km r_f = r_i + v_i*t + 1/2at[SUP]2[/SUP] Using the quadratic equation to find t = 62.5s d(horizontal) = (300)(62.5) = 18.7km [I]Why [/I]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)? [/QUOTE]
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Kinematics of a falling object to hit target
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