Sketch a ray diagram to show that the way by which the fish 'A' and fish 'B' can see each other even through they are at either side of a big stone inside water.​

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

How many meters will a car travel if its speed is 45 m/s in an interval of 11 seconds? question 2 options: a) 450 meters b) 495 meters c) 4.09 meters d) 498 meters

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?