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# 0-kg projectile is fired at an angle of 30.0 above the horizontal with an initial speed of 1.36 102 m/s from the top of a cliff 158 m above level...

A 52.0-kg projectile is fired at an angle of 30.0° above the horizontal with an initial speed of 1.36 102 m/s from the top of a cliff 158 m above level ground, where the ground is taken to be y = 0. 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?m/s