Question

Quinn is testing the motion of two projectiles x and y by shooting them from a sling shot. What can we say best describes the motion of the projectiles ? Assume air resistance is not a factor

The horizontal velocity of projectile X is changing, and the vertical velocity of projectile Y is constant.
The vertical velocity of projectile Y is changing, and the horizontal velocity of projectile X is constant.
The horizontal acceleration of projectile X is –9.8 m/s2, and the vertical acceleration of projectile Y is 0 m/s2.
The horizontal acceleration of projectile Y is –9.8 m/s2, and the vertical acceleration of projectile Y is 0 m/s2.

Answer 1

Answer: The vertical velocity of projectile Y is changing, and the horizontal velocity of projectile X is constant.

Reason: With no air resistance, horizontal motion has no acceleration so horizontal velocity stays constant; vertical motion is accelerated by gravity (≈ -9.8 m/s²) so vertical velocity changes.