This is a 2 part question. A 4000kg truck has a head on inelastic collision with a 2500kg truck. the 4000kg truck moving at 20m/s and the 2500kg is going at 35 m/s. :
A. calculate the total momentum of the trucks before they collide.
B calculate thier speed just after they collide.

A2k pendulum has a speed of 1 m/s at a height of 1/2 meter

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.

What part of the ear is names after tools, such as the hammer and the anvil?