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Find the work done by a weightlifter lifting a 20kg barbell 2.2 m upward at a constant speed.

Respuesta :

Hi1315

Answer:

440J

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

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