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Which among the following is the formula for momentum principle?

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Which among the following is the formula for momentum principle?

(a) pv = 0

(b) p1p2 = 0

(c) P1V1 + P2V2 = 0

(d) P1A1+P2A2 + F = mV2mV1

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This intriguing question comes from Basic Equations of Compressible Flow topic in portion Compressible Flow of Fluid Mechanics

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Correct answer is (d) P1A1+P2A2 + F = mV2mV1

Explanation: For a finite control of volume between two sections, section 1 and section 2, the momentum principle is P1A1 + P2A2 + F = mV2mV1. Where F = component of resultant force exerted on the fluid walls.

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