Question

Which best describes the projectile motion of the marble as it leaves the table at the two different speeds?

A.The marble’s horizontal and vertical velocities change.
B.The marble’s horizontal and vertical velocities remain the same.
C.The marble’s vertical velocity changes, but its horizontal velocity does not.
D.The marble’s horizontal velocity changes, but its vertical velocity does not.

Answer 1

Projectile motion is a two dimensional motion. When you project an object in two dimensional plane, it will move in both, y as well as x direction. The gravity acts only in vertically downward direction i.e towards y direction.  Therefore only vertical component of the velocity is affected and horizontal component remains unchanged.

Answer 2

the answer is C :) so there you go