Book of mass 2 kg is lifted from floor to the table. The height between floor and the table is 1.5 m. Calculate the work done by gravitational force.

-30 J

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-15 J

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0 J

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15 J

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30 J

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Solution

The correct option is A -30 J
The work done by gravitational force, $W =$ gravitational force $\times$ displacement $= m (- g) h$ ( g is negative sign because the book is lifted against gravitational force)
or $W = 2 (- 10) 1.5 = - 30 J$

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Book of mass 2 kg is lifted from floor to the table. The height between floor and the table is 1.5 m. Calculate the work done by gravitational force.

The correct option is A -30 JThe work done by gravitational force, W= gravitational force × displacement =m(−g)h ( g is negative sign because the book is lifted against gravitational force)or W=2(−10)1.5=−30J

The correct option is A -30 J
The work done by gravitational force, $W =$ gravitational force $\times$ displacement $= m (- g) h$ ( g is negative sign because the book is lifted against gravitational force)
or $W = 2 (- 10) 1.5 = - 30 J$