B3. A 100 kg box is initially at rest at the bottom of a 15 m slope at an angle a above the horizontal, where sin(a) = .

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B3 A 100 Kg Box Is Initially At Rest At The Bottom Of A 15 M Slope At An Angle A Above The Horizontal Where Sin A 1 (43.9 KiB) Viewed 70 times

B3. A 100 kg box is initially at rest at the bottom of a 15 m slope at an angle a above the horizontal, where sin(a) = . Five people push the box up the slope and each person pushes with the same force parallel to the slope. Friction resists the motion and the coefficient of friction is n = tos Initially the box accelerates up the slope, but after two seconds, one person falls over and stops pushing the box. Afterwards, the remaining four people pushing find that the box moves up the slope with constant velocity 1. What force does each person apply to the box and what is its initial acceleration? 2. How far up the slope is the box when the person falls over? What is the speed of the box afterwards? 3. What is the total work done by the people pushing to get the box to the top of the slope? What is the total mechanical energy of the box (.e. its gravitational potential energy plus its kinetic energy) when it is at the top of the slope? Why are the total work done and the total mechanical energy different?