Prove that second derivative of position vector is not zero then there must be a force on the body

Prove that second derivative of position vector is not zero then there

1.	Prove that second derivative of position vector is not zero then there must be a force on the body
Answer» Solution :The accelerationis the secondderivative of positionvectorof the body`(VEC(a) = (d^(2)vec(R ))/(dt^(2)))` theforceon THEBODY is If`(d^(2) r )/( dt^(2))ne0, vec(F ) =ne 0`