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A worker pushes a wheelbarrow with a horizontal force of 50.0 N over a level distance of 5.0 m. If a frictional force of 43 N acts on the wheelbarrow in a direction opposite to that of the worker, what net work is done on the wheelbarrow? O 35 J O 0.0 J O 250 J O 10.0 JA hill is 100 m long and makes an angle of 12° with the horizontal. As a 50 kg jogger runs up the hill, how much work does gravity do on the jogger? O 0.0 J O 10 000 J O -10 000 J O 50 000 JA child moving at constant velocity carries a 2 Nice-cream cone 1 m across a level surface. What is the net work done on the ice-cream cone? O 20 J O 2 J O 0.5 J O OJA construction worker pushes a wheelbarrow 5.0 m with a horizontal force of 50.0 N. How much work is done by the worker on the wheelbarrow? O 55 J O 10 J O 250 J O 1250 JA flight attendant pulls a 50.0 N flight bag a distance of 250.0 m along a level airport floor at a constant speed. A 30.0 N force is exerted on the bag at an angle of 50.0° above the horizontal. How much work does she do on the flight bag? O 7510 J O 4820 J 8040 J O 12 500 JWhich of the following energy forms is the sum of kinetic energy and all forms of potential energy? O mechanical energy O nonmechanical energy O total energy O sum (Z) energyA 3.00 kg toy falls from a height of 10.0 m. Just before hitting the ground, what will be its kinetic energy? (Disregard air resistance. g = 9.81 m/s2.) O 294 J O 98.0 J O 0.98 J O 29.4 JIf the only.r force acting on an object is friction during a given physical process, Iwhich of the following assumptions must be made in regard to the object's kinetic energy? (3: The kinetic energy decreases and then increases. 0 The kinetic energy decreases. Q The kinetic energy increases. 0 The kinetic energy remains constant. A force does work on an object if a oomponent ofthe force '3' is perpendicular to the displacement of the object. C: parallel to the displacement of the object moves the object along a path that returns the object to its starting position. Cl perpendicular to the displacement of the object moves the object along a path that returns the object to its starting position. '3' is parallel to the displacement of the object.