If temerature is increased the number of collisions per second is increases or decreases

Iwould say i also took the quiz but it didn't show me if i got it correct or not.

Projectile motion is a form of motion experienced by an object or projectile that is thrown near the earth's surface and moves along a curve path under the action of gravity.   

They coasters are in tear-drop form because of physics. if the ride was in a complete circle, how would the coaster get into the loop, let alone get out of the loop? also, the reason why most coasters are in tear-drop form is because of acceleration. the steeper the turn, the faster the ride.