Question

how can Newton's first law of motion be obtain from the second law of motion

Answer 1

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 ofthe body.

Answer 2

HII BRO THIS IS YOUR ANSWER


according to Newton's second law of motion, the force acting on an object is given as

F=m×a (Force=mass×acceleration)
a=F/m
If F=0,thena=0
Since a=v/t-u/t

it means if a=0, either object is at rest or object is moving with uniform velocity. That is, an object at rest remain at rest or moving with uniform velocity continue to move with same velocity if no external force acts on it.


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