Posted by **Sejul** on Saturday, February 11, 2012 at 7:11pm.

A projectile of mass 1.350 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?

(b) If the projectile rises to a maximum height of only 17.8 m, determine the magnitude of the average force due to air resistance.

I got the "a" correct with 24.69 m

I need help with part B. I used

F(17.8) = 1/2 (1.350)(22.0)^2 = 18.35 N and it was wrong. I need help with the correct equation to use. Thank you.

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