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a projectile mass of 0.750 kg is shot straight up with an intial speed of 18.0 m/s. (a) how high would it go if there were no friction? (b) if the projectile rises to a max height of only 11.8 m, determine the magnitude of the avg force due to air resistance.

Im confused about the 2nd part..the 1st part isn't a prob (i got hf=16.5 m)

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# Homework Help: Work QUICK: And Energy Problem Involving Air Resistance

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