If a bus traveling 15 m/s south speeds up to 20 m/s south, what change has taken place?

Astone is dropped from a cliff and falls 9.44 meters. what is the speed of the stone when it reaches the ground? a. 13.6 m/sec b. 1.39 m/sec c. 185 m/sec d. 9.80 m/sec

Assume this car is driven off a cliff . how many arrows of force need to be drawn in the free body diagram? assume no air resistance -five -one -three -four

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