What is the minimum uncertainty in the vertical component of the momentum of each photon in the beam after the photon has passed through the slit?

According to Heisenberg's Uncertainty principle, both the “position and velocity of the particle” cannot be measured exactly at the same time. The momentum of the particle equals the product of its mass and velocity. And it can be inferred that the “product of the uncertainties” in the “momentum and the position” of a particle equals .  

Immediately after the photon has passed through the slit, given particle has a momentum uncertainty of and its position uncertainty is , then the minimum uncertainty in its momentum will be

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explanation:

the body's situation won't change the forces are equal opposit and on the same body