6. A weight lifter raises a 45.5kg barbell over his head 2.0m in 2.4 se
a. What is the weight of the barbell?
4.09
b. How much work is done on the barbell?
c. How much power is required to lift the barbell?
d. If the weight lifter slows down and did the lift again in half the time, would
it require more power or less power?
e. If the weight lifter slows down and did the lift again in 4.5 seconds, how
much power would be required?
f. Once the weight lifter is done, he returns the barbell to the floor. How
much work is done on the barbell moving it from over his head to the floor?