Question

The velocity of a projectile at launch has a

horizontal component vh and a vertical com-
ponent vv.
Note: Air resistance is negligible.
When the projectile is at the highest point
of its trajectory, which of the following show
the vertical and the horizontal components of
its velocity and the vertical component of its
acceleration in 3 columns?
Vertical Horizontal Vertical
Velocity Velocity Acceleration
1. 0 vh g
2. 0 vh 0
3. vv vh 0
4. 0 0 g
5. vv 0 0

Answer 1

1. 0 vh g

Step-by-step explanation:

As air resistance is negligible, horizontal speaking, nothing is affecting the velocity. So the horizontal velocity of the projectile stays the same, vh.

As for vertical velocity, since there's always a constant gravitational acceleration acting downward, namely g, the vertical speed will decrease until it reaches the top where it is 0, it then starting to increase in magnitude, downward, due to its gravitational acceleration g.