A simple pendulum swings back and forth without air resistan…

A simple pendulum swings back and forth without air resistance. (a) Identify all forms of mechanical energy present in the system and describe how they change during the swing.(b) At what point is the speed of the pendulum the greatest? Justify your answer.(c) Explain why the total mechanical energy of the pendulum remains constant if no non-conservative forces act.

A person stands on a skateboard and throws a heavy medicine…

A person stands on a skateboard and throws a heavy medicine ball forward. (a) Describe all action-reaction force pairs acting in the situation.(b) Explain why the person and skateboard move backward.(c) If the person throws the ball harder, what happens to their backward velocity? Why?

Cart A (mass = 0.75 kg0.75\, \text{kg}) moves at 2.0 m/s2.0\…

Cart A (mass = 0.75 kg0.75\, \text{kg}) moves at 2.0 m/s2.0\, \text{m/s} toward Cart B (mass = 1.25 kg1.25\, \text{kg}), which is at rest. The carts collide and stick together. (a) What is the total momentum before the collision?(b) What is the velocity of the combined mass after the collision?(c) How much kinetic energy is lost in the collision?(d) What type of collision is this, and why?

A ball is thrown straight upward with an initial velocity of…

A ball is thrown straight upward with an initial velocity of 18.0 m/s18.0\, \text{m/s} from the top of a 25.0 m25.0\, \text{m} tall building. (a) How long does it take the ball to reach its highest point?(b) What is the maximum height above the ground that the ball reaches?(c) How long does it take the ball to hit the ground after being released?(d) What is the speed of the ball just before it hits the ground?