Pavan Kumar
Last Activity: 6 Years ago
hey, thank you for asking the question man,
the first thing you need to know f=m*v*dv/dx
force=mass*velocity*derivative of velocity w.r.t displacement
proof: f=m*a [a=accleration]
a=dv/dt * [ dx/dx]
a=dv/dx * dx/dt
= dv/dx * v
f=m*dv/dx * v
so given f=-6x
f= 2 * v* dv/dx = -6x
v dv = -3xdx
v2/2 = -3x2/2 + constant
given at x=3 , v= 8 substituting in the above equation we get c= 91/2
so just substitute the given readings that they have asked
have a good day.