The weightlifter lifted the barbell to a height of 2.2, while doing the work of 3500 J. What is the weight of the barbell?

Given:
A = 3500 J
h = 2.2 m
g = 9.8 N / kg
Find: m.
Decision:
The value of mechanical work can be found by the formula: A = F * h.
The value of force is according to the formula: F = m * g.
We make a substitution: A = m * g * h.
Calculations:
3500 = m * 9.8 * 2.2.
From here: m = 3500 / (9.8 * 2.2) = 3500 / 21.56 = 162.3 (kg).
Answer: the weight of the bar is 162.3 kg.