A newborn baby’s brain grows rapidly. In fact, it has been found to increase in mass by
about 1.6 mg per minute.
a) How much does the brain’s weight increase in one day?
b) How long does it take for the brain’s weight to increase by 0.15 N?

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Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here. Below are the answers:

1a: 
(1.6 * 60) = growth per hour, GPH 
(GPH * 24) = Growth per day. 
1b: 
1N = 101.971621g (let's say 102g) 
so 0.15 * 102 = increase in grams, IIG 
IIG * 1000 = increase in milligrams, IIM 
IIM / 1.6 = how many minutes to reach that weight.