p2something.png An object side a distance d down and incline of height ∆y as shown.  If the coefficient of friction between the surface and the object is 0.250, determine the work done by friction. m = 5.00 kg, d = 9.00 m,  and ∆y = 3.00 m.

A worker pushes a 8.0 kg crate across a level surface with a force of 35.0 N directed at an angle of 25.0° downward from the horizontal. Determine the work done by gravity after the crate is pushed 12.0 m.

What is the kinetic energy of a car of mass 1750 kg traveling at 25 m/s?

The force on an electric charge in an electric field is F = qE where F is the force, q is the electric charge, and E is the electric field.  Determine the speed of a proton (charge = 1.6×10-19 C, mass = 1.67×10-27 kg) after it has been accelerated, from rest, a distance of 0.25 m though an electric field of 2.0×106 N/C. 

p2something.png An object slides a distance d = 9.00 m down a frictionless incline of height ∆y = 3.00 m as shown.  Determine the speed of the object at the bottom of the incline if it starts from rest.

p10(1).png A simple pendulum of length L = 0.75 is pulled back to an angle θ = 35.00 and released.  What is its speed of the pendulum at the bottom of its oscillation?

A 500 kg ore cart traveling at 12.0 m/s on a level track is stopped by a spring of spring constant 35,000 N/m mounted horizontally at the end of the track.  By how much does the spring compress in stopping the car?

A 1500 kg train car traveling east at 3.0 m/s collides with, and couples to, a 1200 kg train car traveling west at 2.0 m/s.  What is the speed of the train cars after coupling?

A harpoon cannon mounted on a 5000 kg fishing boat fires a 15.0 kg harpoon at 250 m/s in a direction of 30.00 up from the horizontal.  Assuming no friction between the boat and the water, determine the recoil speed of the boat.

psoccer.png A 425 g soccer ball traveling horizontally along the ground at 15.0 m/s is kicked in the opposite direction by a player with a speed of 25.0 m/s at an angle of 60.00 up from the horizontal.  If the time of contact between the player and the ball for the kick was 0.025 s, what was the magnitude of the force exerted on the ball?