A bullet is fi red from a rifle with speed with respect to the horizontal axis (Fig. P6....

A bullet is fi red from a rifle with speed with respect to the horizontal axis (Fig. P6.51) from a cliff at height h above the ground below. (a) Use conservation of energy principles to calculate the speed of the bullet when it strikes the ground. Express your answer in terms of and ignore air drag. (b) Explain why your result is independent of the angle