Because of the large mass of a 2 kg ball compared to an electron (m_e = 9.1 × 10^-31 kg), we know at the same time the position and velocity of the ball with very small uncertainty, as opposed to an electron, for which the uncertainty in knowing the velocity is very large if we know its position.

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This statement is a reflection of the Heisenberg Uncertainty Principle, which states that the more precisely the position of a particle is known, the less precisely its momentum can be known, and vice versa. This principle is significant for particles of very small mass, such as electrons, but for macroscopic objects like a 2 kg ball, the uncertainties in position and velocity are so small that they are practically negligible.

Because of the Large Mass of a 2 Kg Ball