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question 1
linear momentum is defined to be
mass times speed,
mass times velocity,
mass times acceleration,
weight times velocity,

Explanation:

Linear momentum is a vector quantity. By definition, it is calculated as the product of an object's mass and its velocity. Mass times speed gives a scalar quantity (not momentum). Mass times acceleration is force ($F = ma$). Weight is mass times gravitational acceleration ($w=mg$), so weight times velocity is not momentum.

Answer:

mass times velocity.