How high (in meters) can a 40 N force move a load, when 395 J of work is done? (round to the nearest 10th)

Two steel balls, each of mass m, are welded to a light rod of length l and negligible mass and are initially at rest on a smooth horizontal surface. a horizontal force of magnitude f is suddenly applied to the rod as shown. determine (a) the instantaneous acceleration a of the mass center g and (b) the corresponding rate at which the angular velocity of the assembly about g is changing with time.

The energy equivalent of the rest mass of an electron is

Abowling ball rolling down the lane toward the pins has gravitational potential energy. a. no b. a lot of c. a little