9. Saagar gives a certain teacher some sass followed by an eye roll. Suddenly, a chankla is thrown at him. The flip-flop moves from rest to 12km/hr when it strikes Saagar in the back
of the head. The flight of the chankla takes only 1.2 seconds. What is the average
acceleration of the chankla?

May someone explain how to do this question?

What is created when solids,liquids,an gases mix with one another

You throw a small rock straight up from the edge of a highway bridge that crosses a river. the rock passes you on its way down, 7.00 s after it was thrown. what is the speed of the rock just before it reaches the water 28.0 m below the point where the rock left your hand? ignore air resistance.