Question

Explain how Newton's first law of motion follows from second law.

Answer 1

Explanation:

Newton's law of motion give us the relation between the force acting on

a body and the motion of the body .

These laws are as follows ... Newton's second law of motion states that force is equal to the change in momentum per change in time. For a constant mass force equals mass time acceleration i.e.

F=m*a.

Answer 2

Explanation:

The second law of motion sates that the force is given by the product of mass of an object and velocity with which it is moving. Mathematically, it is given by :

$F=ma$

a is the acceleration

$a=\dfrac{v-u}{t}$

u and v are the initial and final velocities respectively

$F=\dfrac{m(v-u)}{t}$

Let F = 0,

$0=\dfrac{m(v-u)}{t}$

v = u

It is clear that if the external force is zero, the initial velocity is equal to the final velocity. This is the first law of motion.