Question

An airplane is in level flight at a speed of 400 km/h and an altitude of 1000 m when it drops a bomb. (a) Find the time it takes the bomb to reach the bottom. (b) Find the bomb's speed when it strikes the ground.

Answer 1

time taken to it the groun is \[t=\sqrt{2H/g}\] = 10*2^1/2s

Answer 2

Conservation of energy gives us the equivalence of potential and kinetic energy.\[mgh=\frac{1}{2}mv_f^2 \Rightarrow \boxed{v_f = \sqrt{2gh}}\]