What is the vertical acceleration of a dart that is launched horizontally with an initial velocity of 2.3 m/s?

A horizontally launched dart has no initial vertical velocity, but gravity still causes vertical acceleration. Near Earth’s surface, that acceleration is 9.8 m/s² downward, or –9.8 m/s² if upward is positive. Therefore, the correct choice is –9.8 m/s².

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