Answer:
The work has Been done is 2503.12 J .
Step-by-step explanation:
Formula for workdone is given by
Workdone = Force × Distance
As w = mg
Where m is the mass , g is the acceleration of gravity .
As given
Ben Pumpiniron applies an upward force to lift a 129-kg barbell to a height of 1.98 m at a constant speed.
m = 129 kg
g = 9.8 m / s²
Putting in the w =mg
w = 129 × 9.8
= 1264.2 kg m / s²
(As given in the question force is constant thus force doing the work is equal to weight .)
Thus
Force = 1264.2 kg m / s²
Workdone = Force × Distance
= 1264.2 × 1.98
= 2503.12 J (Approx)
Therefore the work has Been done is 2503.12 J .
