Question

A projectile is fired from the origin (at y = 0 m) as shown in the diagram. The initial velocity components are and The projectile reaches maximum height at point P, then it falls and strikes the ground at point Q, which is 20 m below the launch point. What is the vertical component of the velocity (Vy) of the projectile at point P?+80 m/s-80 m/s+160 m/szero-160 m/s

Answer 1

At point P, the Y speed is 0

This is because when an object reahces the max high, the gravity desacelerated enough to make the speed 0, and start moving the object to the earth (down)