A solid object is made of two materials, one material having density of 2000 kg/m3 and the other having density of 6000 kg/m3 . If the object contains equal masses of the materials, what is its average density?
a. 3000 kg/m3
c. 5000 kg/m3
b. 3200 kg/m3
d. more information is needed
A
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