A 149-{\rm g} baseball is dropped from a tree 12.0 m above the ground. If it actually hits the ground with a speed of 7.50 m/s, what is the magnitude of the average force of air resistance exerted on it?

Answer 1

(Average force)*H = Energy lost as work done against air friction
= M g H - (1/2)MV^2

H = 12 m M = 0.149 kg

I don't know what your -{\rm symbiol is supposed to mean, but I know roughly what a baseball's mass is.

Solve for Avg. Force