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But,

**what if the ball accelerates**and collides with another ball ?

I think I

**can't**use mass*velocity for the momentum because the velocity is

**not constant**.

Then, I think that I might have missed the Δ symbol.

Because I think that the conservation of momentum is derived like below.

F = -F

m Δv/Δt = m Δv/Δt

Because the object A contacts object B at the same time as the object B contacts object A, so we can cancel Δt

So, m Δv = m Δv

So, is the formula m Δv ?

But, I doubt it, because I think non-accelerating objects

**which has Δv = 0 since its velocity doesn't change**also have momentum

Or, maybe the formula is

**mass times the velocity the object has when contacting another object**.

But, I don't know how to derive the formula (p = m*v) since F = ma = m Δv/Δt

**has**a delta symbol and momentum formula

**doesn't have**delta symbol.

So, What is the momentum formula ?

Is it mass times the velocity the object has when contacting another object or m v ?

Or is it m Δv ?

If the formula is m v , Please tell me how to derive that formula.