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- (i)10J(ii)−8.75J
- (i)10J(ii)8.75J
- (i)100J(ii)−8.75J
- (i)1.25J(ii)−8.75J

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Solution

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m=1g=11000kg

h=1km=1000m

work done by gravitional force wg−mgh

wg=11000×10×1000

Change in kinetic energy △K.E=12mv2−0

=1211000×50×50−0

=1.25J

Work energy theorem: wg+wairresistance=△K.E

10J+resistance=1.25−10

where resistance=−8.75J

wg=11000×10×1000

Change in kinetic energy △K.E=12mv2−0

=1211000×50×50−0

=1.25J

Work energy theorem: wg+wairresistance=△K.E

10J+resistance=1.25−10

where resistance=−8.75J

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