State Newton's second law .

Explanation

`(i)` Newton's second law is cause and effect relation. Force is the cause and acceleration. is the effect.
`(ii)` Conventionally, the effect should be written on the left and cause on the right hand side of the equation. So the correct way of writing.
`(iii)` Definition : Rate of change of momentum is called Force (or) Force is an external agency which changes the state of rest or of uniform motion of body along a straight line.
Newton's second law is `mveca=vecF` (or) `(dvecp)/(dt)=vecF`