1000 kg car changes its velocity from 10 m/s to 24 m/s in 8 s. Calculate the work and power of the engine.

A 1400 kg car delivers a constant 42 hp to the drive wheels. We assume the car is traveling on a level road and that all frictional forces may be ignored.Calculate the car's acceleration when its speed is 20 m/s

An accelerating object of mass m=11 kg is fired with an initial speed vi=6 m/s at a starting point. If its kinetic energy at its final destination is K.E=389 J. What is the resultant work (in joules) done on the object?

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.

Reference: Horsepower Lab. John, of mass 82.4 kg, can do work for about 2.0 minutes at the rate of 1.0 hp. How long will it take him to climb three flights of stairs, a vertical height of 12.0 m?   1hp = 1 horsepower.

A 2.0-kg particle moving along the x-axis is acted upon by the force that varies with position as shown below. The speed of the particle at x = 0 is v = 6.0 m/s. Find the work done by the force from x = 0 to x = 4.0 m, and particle’s speed at x = 4.0 m.

1. A jeep with mass of 2000 kg is going 18 m/s at the bottom of a hill that is 50.0m high. When it reaches the top, it is travelling at 10m/s. (a) what is the total work done by all forces (the jeep engine, the mud, gravity, etc) as it ascends the hill? (b) What is the minimum work required by engine of the jeep if only the engine and gravity are doing work (if there is na friction, forces from mud, etc)?

A mechanic pushes a 3850 kg car from rest to a speed of v, doing 5083 J of work in the process. Find the speed v. Neglect friction between car and road. Answer in units of m/s.

Sam's job at the amusement park is to slow down and bring to a stop the boats in the log ride. If a boat and its riders have a mass of 1200 kg and the boat drifts in at 1.3 m/s how much work does Sam do to stop it? Express your answer in joules.

Mama Mia lifts up a 6.2 kg pie from the table a distance of 1.8 meters high with an acceleration of 2.1m/s^2. What force does mama Mia need to apply to lift the pie ? How much work was done by mama Mia?