As we reliably know from the school curriculum in physics, in order to determine what the buoyancy force will be equal to, you should use the formula below:
Fout = p * g * V, where p is, in fact, the density of the liquid, and V is, accordingly, the volume of the object immersed in it.
We find out that the given force will be equal to the value, if from the condition of our problem we know for sure that the volume of the body is 15 dm3:
15 dm3 = 0.015 m3;
800 * 10 * 0.015 = 120.
Answer: Ejection force = 120 N.
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