As a roller coaster car starts down a slope, it’s velocity is 4m/s. but 3 seconds later it’s velocity is 22m/s in the same direction. what is its acceleration

If the speed of a particle triples ,by what factor does its kinetic energy increase?

Place me with this question is my last question

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy.work depends on the square of the change in potential energy.work is equal to the negative of the change in kinetic energy.work is equal to the square of the change in kinetic energy