Quinn launches two projectiles, x and y, at two different speeds. which best compares the motion of the projectiles?
a. the horizontal velocity of projectile x is changing, and the vertical velocity of projectile y is constant.
b. the vertical velocity of projectile y is changing, and the horizontal velocity of projectile x is constant.
c. the horizontal acceleration of projectile x is –9.8 m/s2, and the vertical acceleration of projectile y is 0 m/s2.
d. the horizontal acceleration of projectile y is –9.8 m/s2, and the vertical acceleration of projectile y is 0 m/s2.
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