Answer:
1.03m/s
Explanation:
According to the question
Fdrag = bv²
now Fdrag = weight of the box
that is Fdrag = mg
where m = mass of the box, 0.6 Kg
and g = acceleration due to gravity
thus,
Fdrag = bv² becomes
mg = bv²
making v the subject of formula


v = 1.03m/s
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Solution :
Mass of the sphere, m = 10 kg
Diameter, D = 300 mm = 0.3 m
Volume of the sphere is 

So the volume of displaced water, 
Additional mass, 


So the total mass, 
= 7.0686 + 10
= 17.0686
Force required, F = Ma

= 170.686 N