Question

deduce newtons first law of motion from the force equation ....plz help ​

Answer 1

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Newton's first law states that a body stays at rest if it is at rest and moves with a constant velocity unit if a net force is applied on it. Newton's second law states that the net force applied on the body is equal to the rate of change in its momentum.

F = ma

or F = m(v-u) / t

or Ft = mv - mu

That is, when F = 0, v = u for whatever time, t is taken. This means that the object will continue moving with uniform velocity, u throughout the time, t. If u is zero than v will also be zero, i.e., object will remain at rest.

Answer 2

Answer:

Newton's second law states that F=ma.

Assuming that no external force is being applied on the body, i.e., F=0,

0 = ma

=> 0 = m [(v-u)/t]

=> 0/m = (v-u)/t

=> 0*t = v-u

​=> 0 = v-u

=> u = v

According to Newton's first law of motion, a body moving with a certain velocity continues to move with the same velocity, i.e., u=v; until and unless an external force is applied, which may change the speed of the body.