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1 joule= kg.m2/s2
if mass becomes double then kg=2kg
and if the unit of time reduces to half then s=s/2
now by replacing the above in 1st we get
1 joule = 8 kgm2/s2
so 8 joule = 64 kg m2/s2
whether my ans is crt?i am not sure abt it
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