The law of inertia to both moving and no moving objects. true or false

Work = force × a. work b. energy c. distance d. momentum

For the car in the picture ,in which direction is the normal force? -into the screen -down -out of the screen -up

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?