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Model Paper 5 — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceModel Paper 52 Marks
Question
Calculate the work done against the gravity.
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Answer

Suppose a body of mass $m$ is lifted vertically upwards against the gravity ( g ) through a distance h .
Here, the force ( F ) required to lift the body = weight of the body, mg (where m is mass and g is acceleration due to gravity).
Now, Work done (W) in lifting a body $=$ Force $\times$ displacement $=$ Weight of body $\times$ Vertical distance
$
W=mg \times h=mgh .$
Therefore, Work done against the gravity = mgh

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