Momentum

S Fx = D(mvx)/Dt and S Fy = D(mvy)/Dt .

We can re-write this as:

(SFx)*Dt = D(mvx) and (SFy)*Dt = D(mvy)

The quantity on the right side of the above equations, mv, has its own name:

momentum: p = mv

Since m is a scalar and v is a vector, p is also a vector.

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