Question

A barbell of mass "m" is lifted vertically upwards, at ?a constant velocity, to a distance "h" by an outside ?force. How much work does that outside force do ?on the barbell?

A) mg
B) -mhg
C) mgh
D) 0
E) -mg

Answer 1

One equation for work is:\[W=Fd\]where W is work; F is force; and d is the distance over which the force is applied.

Answer 2

and the force is F = m g