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60. Go (a) Objects A and B have the same mass of 3.0 kg. They melt
when 3.0 × 10ʻ J of heat is added to object A and when 9.0 × 10ʻ J is
added to object B. Determine the latent heat of fusion for the substance
from which each object is made. (b) Find the heat required to melt object
A when its mass is 6.0 kg.

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