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A projectile is fired from a ship at a distant, floating target. Which of the following statements are true? (There can be more than one correct choice.)

a. The vertical component of the projectile's acceleration does not change with time.

b. The speed of the projectile does not change with time.

c. The vertical component of the projectile's velocity does not change with time.

d. The horizontal component of the projectile's acceleration does not change with time.

E. The horizontal component of the projectile's velocity does not change with time.

Thanks for your help!