A police officer at rest at the side of the highway notices a speeder moving at 62 km/ h along a straight level road near an elementary school. When the speeder passes, the officer accelerates at 3.0 m/ s 2 in pursuit. The speeder does not notice until the police officer catches up. b) How far will they move from the position where the officer was at rest?

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