posted by Jessica .
A .15kg ball is dropped from a height of 14 m to the ground below, and hits the ground with a speed of 12 m/s.
With what speed would the ball have hit the ground if there were no air resistance?
How much work does the air resistance do on the ball?
work air resistance did?
mgh-1/2 m 12^2=work done on air
Air resistance does not do work, it absorbs energy at best.