for a symmetrical angle launch projectile what quanity is/are zero at the max altitude location? Ay, Ax, Vy, Xy, X, Y (circle ones that apply)

A bike rider accelerates constantly to a velocity of 7.5 m/s during 4.5s. The bike's displacement during the acceleration was 19m. What was the initial velocity of the bike?

In an action movie, a helicopter with the heroes on board is seen escaping from an underground bunker inside a volcano. The Volcano chimney is 605m tall. The helicopter is moving up with a constant acceleration of 10m/s^2. the villain realized of this and shoots the helicopter with a cannon. If it...