Question

calculate the workdone (kilo joules)in lifting a mass of 10 kg through a height of of 10 meter

Answer 1

${\huge{\boxed{\mathcal{\red{Answer}}}}}$

1KJ (approx)

${\huge{\boxed{\mathcal{\red{Explanation}}}}}$

• Work is said to be done when a force is applied on a body and the body undergoes displacement .
• Work is defined as the product of force applied and displacement.
• It's also the product of mass of a body , it's acceleration and height or displacement.
• S.I unit of work is joule (J). And Kilojoule (KJ)
• 1KJ = 1000J.

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According to question :

Mass of body = 10kg.

Lifted up by height = 10m

Work done = ?

Now work done on this body :

$w = mgh$

Here the accelerating force acting on the body is acceleration due to gravity (g) = 9.8m/s^2.

$w = 10 \times 9.8 \times 10$

$w = 98 \times 10$

$w = 980j$

Since 1KJ = 1000J

Thus 980J = 1KJ (approx)

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BY SCIVIBHANSHU

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Answer 2

Mass of particle = 10 kg

∴ Weight = mg = (10 kg)(10 m/s²) = 100 N.

{Weight is also a Force.}

Displacement on the object = 10 m

We know,

W = F • s

⇒W = (100 N)(10 m)

⇒W = 1000 Nm

⇒W = 1000 J

∵ 1000 J = 1 kJ,

∴ W = 1 kJ {Answer}.