Question 5 (10 points) Lamar Gant, U. S. Powerlifting star, became the first man to deadlift five times his own body weight in 1985.
Deadlifting involves raising a loaded barbell from the floor to a position above the head with outstretched arms.
Determine the work done by Lamar in deadlifting 321 kg to a height of 1.3 m above the ground.
оа
Ob
Oc
Od
417.30)
4238.91 )
431.73)
4093.71 )

Iwould say a is accurate

Your answer is 32 hope i  

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j