A particle moves along the smooth curve y=f(x) from (a,f(a)) to (b,f(b)). The force moving the particle has constant magnitude k and always points away from the origin. Show that the work done by the force is
A particle moves along the smooth curve y=f(x) from (a,f(a)) to (b,f(b)). The force moving the particle has constant magnitude k and always points away from the origin. Show that the work done by the force is