Posted by **Kelsey** on Thursday, November 3, 2011 at 5:22pm.

A projectile of mass 0.550 kg is shot straight up with an initial speed of 22.0 m/s.

(a) How high would it go if there were no air friction?

I get 24.7m for this.

(b)If the projectile rises to a maximum height of only 13.6 m, determine the magnitude of the average force due to air resistance.

forceresistance*13.6=.5mv^2 is the formula I think I am supposed to use. I end up with 9.78. However this is wrong. What am I doing wrong?

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