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a 5 kg vrick of 20cm*10cm*8cm dimensionless lying on the largest base.it is now made to stand with length vertical.if g=10m/s calculate the amount of work done
a)3j
b)7j
c)5j
d)9j
initially center of mass was at height 4cm from ground.
final height of center of mass is 10 cm
change in height = 10 -4 = 6cm
work done = change in potential energy
=mgh [h is the change in height]
=5x10x(6/100) =3j
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