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keemosabi
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Homework Statement
A projectile of mass 1.350 kg is shot straight up with an initial speed of 13.0 m/s.
(a) How high would it go if there were no air friction?
I found this to be 8.622 m.
(b) If the projectile rises to a maximum height of only 7.4 m, determine the magnitude of the average force due to air resistance.
Homework Equations
u + k = u + k
The Attempt at a Solution
I found the difference in potential energy at m = 7.4 and m = 8.622, which equals the work done. I then solved for F in the formula W = F D cos theta. What did I do wrong?