When a net force of 3 N is applied to a 0 75 kg cart the cart's velocity changes from 0.2 m/s to 18 m/s in 0.3s Suppose that by adding masses the total mass of the cart doubles the same force applied for the same amount of time what will the change in velocity be in m/s? plz help no links or bad answers I’m in a test;(

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