The table below shows data of sprints of animals that traveled 75 meters. At each distance marker, the animals' times were recorded. Which animal is showing the greatest average acceleration from the 50-meter mark to the 75-meter mark? A. Animal 1
B. Animal 2
C. Animal 3
D. Animal 4

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