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Correct option is A)

$h=1km=1000m$

work done by gravitional force $w_{g}−mgh$

$wg=10001 ×10×1000$

Change in kinetic energy $△K.E=21 mv_{2}−0$

$=21 10001 ×50×50−0$

$=1.25J$

Work energy theorem: $w_{g}+w_{airresistance}=△K.E$

$10J+resistance=1.25−10$

where resistance$=−8.75J$

$wg=10001 ×10×1000$

Change in kinetic energy $△K.E=21 mv_{2}−0$

$=21 10001 ×50×50−0$

$=1.25J$

Work energy theorem: $w_{g}+w_{airresistance}=△K.E$

$10J+resistance=1.25−10$

where resistance$=−8.75J$

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