The momentum does not change because he is going the same speed just a different way.
I believe the answer is true.
Answer:
11.2m³
Explanation:
Applying Archimedes principle we have it that
Weight of submarine+ weight of tank+ weight of compound air =uptrust
So
(40000+2000+37V) x9.8= (30+V) 1030 x 9.8
38910= 993V
V= 11.2m³
V= d/t, The answer is 0.83 km/m.