A 56.0-kg projectile is fired at an angle of 30.0° above the horizontal with an

Question

A 56.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 144m/s from the top of a cliff 134 m above level ground, where the ground is taken to be y = 0.

(a) What is the initial total mechanical energy of the projectile?

= 654147.2J

b) Suppose the projectile is traveling 102.1 m/s at its maximum height of y = 350 m. How much work has been done on the projectile by air friction?

=-170183.72J

(c) What is the speed of the projectile immediately before it hits the ground if air friction does one and a half times as much work on the projectile when it is going down as it did when it was going up

? I only need the answer to part C!! Thanks :)

Explanation / Answer

654147.2 - 170183.72 - (1.5*170183.72) = 0.5*m*v^2

228687.9 = 0.5*m*v^2

v = 90.37 m/s

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