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By definition, force F is the rate of change of momentum p.

Thus, F = dp/dt

Now, momentum is the product of mass m and velocity v.

If mass is constant,

F = m x dv/dt

F = ma (a = dv/dt)

where a is acceleration.

Now if velocity is constant but mass is changing,

F = v dm/dt.

Force is also equal to the product of pressure and area.

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