A small dense, dark area thought to be the beginning of a protostar

If the ama of the inclined plane below is 2, calculate the ima and efficiency. ima = efficiency =

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.