A force is acting on a body moving along x-axis in the direction of motion of the body. If this force produces a potential energy `u=Ax^(4),` where `A=1.2Jm^(-4),` then the what is the force acting on the body when the body is at `x=-0.8m`?

Explanation

Here, `U=Ax^(4)`
`F_(x)=-(partialU)/(partialx)=(partial )/(partial x)(Ax^(4))=-4Ax^(3)`
When `x=-0.8m, ` then
`F_(x)=-4xx1.2(-0.8)^(3)=2.46N`