Question

Mr b Kayla and gabby are working out to get fit fr the summer Mr b is using a barbell that weighs 50kg and lifts it a distance of 4 meters. Kayla is using a barbell that weighs 45kg and lifts it a distance of 7 meters and gaby is using a barbell that weighs 47kg and lifts it a distance of 8m who is working the hardest

Answer 1

This question involves the concepts of potential energy and work.

"Mr. Gabby" is working the hardest.

Who is working the hardest?

In this case, the work done by each person is equal to the potential energy produced by raising the barbell.

$W = P.E=mgh$

where,

• W = work done

• m = mass of barbell
• g = acceleration due to gravity = 9.81 m/s²
• h = height raised

For Mr. b

• m = 50 kg
• h = 4 m

Therefore,

$W=(50\ kg)(9.81\ m/s^2)(4\ m)\\W=1962\ J$

For Mr. Kayla

• m = 45 kg
• h = 7 m

Therefore,

$W=(45\ kg)(9.81\ m/s^2)(7\ m)\\W=3090.15\ J$

For Mr. Gabby

• m = 47 kg
• h = 8 m

Therefore,

$W=(47\ kg)(9.81\ m/s^2)(8\ m)\\W=3688.56\ J$

It is clear that most work is done by Mr. Gabby.

Learn more about potential energy here:

https://brainly.com/question/24284560

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