Question

a body of mass 100kg is lifted up a height of 1m. calculate the work done​

Answer 1

To lift a body the applied on it must be ≥mg

where m is mass of body

g is acceleration due to gravity

Work done = Force x Displacement

Let's take Force =mg

and g=10

Work Done = 100(10) x 1meter

= 1000 Joules

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Answer 2

Given :-

• A body of mass 100kg is lifted up a height of 1m. Calculate the work done​

Solution :-

• We know that, work done =  F.s

      → Here, s = h as we are raising the body to some height

      → F = mg

     ⇒ Work done = mgh

• Now, let us substitute the values  

       ⇒ Work done = 100 × 9.8 × 1 = 980 J

∴ The work done is 980 J

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