A bodybuilder lifts a 350 N set of weights from ground level to a position over his head, a vertical distance of 2.15 m. How much work (in J) does the bodybuilder do? Assume the weights are moved at constant speed.

A shopper pushes a grocery cart for a distance 21.5 m at constant speed on level ground, against a 32.5 N frictional force. He pushes in a direction 26.5° below the horizontal. What is the work done on the cart by the gravitational force, in joules? What is the work done on the cart by the shopper, in joules?  Find the magnitude of the force, in newtons, that the shopper exerts on the cart. What is the total work done on the cart, in joules?

A cheerleader lifts his 68 kg partner straight up off the ground a distance of 0.72 m before releasing her. Assume the partner’s velocity is zero at the beginning and the end of the lift. The acceleration of gravity is 9.8 m/s2 . If he does this 22 times, how much work has he done? Answer in units of J.

A 1.9 kg book is lying on a 0.75mm high table. You pick it up and place it on a bookshelf 2.1 mm above the floor. During this process, how much work does gravity do on the book? During this process, how much work does your hand do on the book?   Express your answer with the appropriate units.

A mother pulls her child on a sled across a rough patch of snow. The sled and child have a combined mass of 25kg. The sled’s tow rope is at 42° angle above the horizontal and the mother exerts a force of 65N. If the sled accelerates from rest at 1.5 m/s2 over 15m, what is the work done by friction on the sled?

A child pulls a toy 2.8 m across the floor by a string, applying a force of constant magnitude 0.950 N. During the first 1.4 m the string is parallel to the floor. During the second 1.4 meter the string makes an angle 42.0 degrees with the horizontal. What is the total work done by the child on the toy in joules?

As an object moves from point A to point B only two forces act on it: one force is nonconservative and does -40 J of work, the other force is conservative and does -60 J of work. Between A and B, O A. the potential energy of object increases, mechanical energy increases O B. the potential energy of object decreases, mechanical eneray increases O C. the potential energy of object decreases, mechanical eñey decreases the potential energy of object increases, mechanical energy decreases

A horse pulls a 300 kg sled for 50 m over level ground at constant speed, exerting a force of 3000 N at 30° above horizontal. How much work is done by the horse on the sled? 150 kJ 2940 J 130 kJ

A car with the mass m=1600kg coasts down an incline from an initial height of h=7m with an initial speed v0=15m/s. When it reaches the bottom of the incline its speed is 20m/s. How much work did friction do on the car? This is the full question. No acceleration given. Assistance please.

A man pushes an 46-N crate a distance of 62 m upward along a frictionless slope that makes an angle of 30 with the horizontal. The force he exerts is parallel to the slope. If the speed of the crate increases at a rate of 2.2 m/s, then the work done (in J) by the man is.