According to the work-energy theorem, the amount of net work done on an object is equal to the change in an object’s ____________________.

A child of mass m = 16 kg slides down a slide of height h = 2.7 m without friction. Let gravitational potential energy be zero at ground level. a)Write an expression for the child's total mechanical energy, E, at the top of the slide, in terms of the variables in the problem and the acceleration due to gravity g.  b)Calculate the change in the child's potential energy, ΔU in joules, from the top to the bottom of the slide at ground level (i.e. ΔU = Uground - Utop).  c)What is the child's final speed, vf in m/s?

You are throwing a ball to a friend while taking physics and begin to wonder about work. You know that when you throw, you exert a force of 655 N on the ball (which has mass 1.84 kg), and that you do so for a distance of 0.27 m. If you start the throw from rest, what is the final speed of the ball? When you show your work for this question, you must do the calculations using work and energy for credit. If you use kinematics you will not recieve credit. Your Answer: units Answer

A box of mass 4.0 kg is accelerated from rest across a floor at a rate of 2.0 m/s^2 for 9.0 s . a.) Find the net work done on the box. Express your answer to two significant figures and include the appropriate units. W= ________