Each soccer player can run at a speed of 7.5 m/s to kick a ball. a player can kick a stationary ball giving it a speed of 5 m/s. explain how can 5 soccer players send a ball forward with a speed of 192.5 m/s or 693 km/h, ignoring any air resistance (for example, assuming this is done on the moon). include a diagram with your explanation.

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