Phil the Physics Phool stands at the edge of a 45 m tall cliff. He throws a rock upwards at 25
m/s. a) What is the speed of the rock as it
strikes the ground 45 m below Phil?

b) What is the distance (NOT THE
DISPLACEMENT) traveled by the rock from
Phil's hand to the ground?

If you can provide some explanation I would
greatly appreciate it!! :)

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm