Question

How to show that Newton first law enforcement f motion can be mathematically stated from mathematical expression for second law of Newton?

Answer 1

According to the second law of motion :

F=ma

F = m (v-u/t)

F = mv-mu/t

Ft = mv-mu

If F=0

0(t) = mv-mu

0 mv-mu

mu=mv

u=v

If object is at rest

u=v=0

If object is in motion

u=v

same value