Newton's second law: The rate of change of the momentum of an object is directly proportional to the resultant (net) force acting upon it.
F(proportional to) mv - mu/t
F(proportional to) m(v-u)/t, which gives F(proportional to) ma
One newton is the force that causes a mass of one kilogram to have an acceleration of one metre per second each second.
1kg x 1ms^-2 = k x 1N
Newton's second law becomes F=ma if the mass is constant.
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