Question

derive newtons first law of motipn from second law

Answer 1

newtons second law of motion states that
F=ma
so if F=0then a will also be 0 as mass is constant
so we can say that if the force applied is zero then the acceleration will also be zero and object will either be at rest or in constant motion which is described in newton first law of motion

Answer 2

Newton's 1st law : An object will remain at rest or in motion until or unless an external force is applied to it. It means that initial (u) = final (v)
u = v


Newton's second law: The rate of change in momentum is directly proportional to the force applied.
It means F= m×a

Derivation:-
F = m×a.......1
We know that, a = v-u/t ........2
Put value of 2 in 1
F = m× (v-u)/t
F×t = m (v-u)
Let Force =0
0 = m(v- u)
m×0 = v-u
0 = v-u
u = v
#Hence proved!