160j of work was needed in order to move an object 8m across a floor what was the force in N that was needed to do this job
A screw is really an wrapped around a cylinder
You set up a pulley to help you lift something you anchor the rope at one end and arrange a moveable pulley to achieve a mechanical advantage of 2 by the time you have lifted the object 5m off the gro
How far is the train located from its start after completing both movements if it goes forward at a speed of 1 ms for 20 seconds then stops and goes backward at a speed of 0.5 ms for 4 seconds