A coin is thrown horizontally from the top edge of a vertical building with a speed of 10 m/s. It falls half the height of the building in the last second of its fall. 1. Find the total fall time in [s].

2. Find the height of the building in [m].

3. Find the horizontal distance from the base of the building in [m].

The energy equivalent of the rest mass of an electron is

During a medieval siege of a castle, the attacking army uses a trebuchet to hurl heavy stones at the castle walls. if the trebuchet launches the stones with a velocity of at an angle of 50.0°, (a) how long does it take the stone to hit the ground? (b) what is the maximum distance that the trebuchet can be from the castle wall to be in range? (c) how high will the stones go? show all your work.

Aspacecraft that renters the earth’s atmosphere drastically slows down. the amount of kinetic energy the spacecraft has as it reenters the earths atmosphere