Answer:
440J
Step-by-step explanation:
First, let us find the weight of the barbell.
The formula to find the weight is :
W = m × g
Here,
m ⇒ mass ⇒ 20 kg
g ⇒ acceleration of gravity
Let us find it now.
W = m × g
W = 20 kg × 10 ms⁻²
W = 200N
And now let us find the work done by this weight lifter.
Work = Force × Displacement
Let us find it now.
Work = Force × Displacement
= 200N × 2.2m
= 440J