A cart with mass of 20 kg is pushed horizontally by a man at a constant velocity. He performed work of 4000 J, and the cart traversed a distance of 50 m. What is the total resisting force of this motion?

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 4.8× 104 kg, and the force causes its speed to change from 7100 to 4900m/s. (a) What is the work done by the force? (b) If the asteroid slows down over a distance of 2× 106 m determine the magnitude of the force.

A force of 4 N is applied to an object at an angle of 40 degrees to the X-axis. The object slides in the direction of the positive X-axis at constant velocity. What is the work done by friction if the object slides for 1 m?

While riding on an elevator, a person has twoforces acting on him, a normal force and a gravity force. Suppose the person has mass m is on an elevator that 1 descends a distance d. If the total work on the person is Wiotal = -mgd, what is 4 the magnitude of the normal force? Is the elevator speeding up or slowing down? The knowns in this problem are m and g.

A helicopter lifts a 65 kg astronaut 18 m vertically from the ocean by means of a cable. The acceleration of the astronaut is g/10. (a) How much work is done on the astronaut by the force from the helicopter? (b) How much work is done on the astronaut by her weight? (c) What is the kinetic energy? (d) What is the speed of the astronaut just before she reaches the helicopter? m/s

A man pulls a 4.6-kg sled 50 meters along an angled hill with a force of 36 N, which elevates the man 28 meters above the bottom of the hill. The man then hops on his sled and slides from rest to the bottom of the hill back along his 50 meter path, during which a 299 N frictional force acts upon his sled. How much work in Joules does the man do against friction in pulling the sled up the hill?

A 10 kg barbell is rolling down a hill. There is no friction or air resistance acting on it, only the force of gravity. If it starts out moving 2 ms1, and ends up moving 7 ms1, then how much work does gravity do on it?

A different robot begins pushing a 10kg box that was already moving at 0.5m/s [Right] along a surface with a coefficient of kinetic friction of 0.15. The robot pushes with only 3N [Right] of force. What is the acceleration of the box?  Using the Work-Energy theorem, calculate how much work the robot does on the box accelerating it from 0.5m/s [Right] to 2m/s [Right]. What distance did the robot push the box? Use kinematics to check your work.

An asteroid is moving along a straight line. A force acts along the displacement of the asteroid and slows it down. The asteroid has a mass of 3.5× 104 kg, and the force causes its speed to change from 7100 to 5400m/s. (a) What is the work done by the force? (b) If the asteroid slows down over a distance of 1.8× 106 m determine the magnitude of the force. (a) Work = Choose your answer for sign in part (a) here                                                             Type your answer for part (a) here Choose your answer for units in part (a) here                                                             (b) F = Type your answer for part (b) here Choose your answer for units in part (b) here

You are out on the road with your friends, when you suddenly run out of gas. You and your friends apply a cumulative force of 103 N to push the car 96 m to the nearest gas station. What is the work done on the car?