An object is thrown vertically upward with an initial velocity of 15 m/s. Taking g = 10 m/s² upward as positive, which expression correctly gives the velocity after 2 seconds?

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Question

An object is thrown vertically upward with an initial velocity of 15 m/s. Taking g = 10 m/s² upward as positive, which expression correctly gives the velocity after 2 seconds?

Accepted Answer

B. v = 15 − (10 × 2) — Taking upward as positive, gravity acts downward so a = −10 m/s². Using v = u + at: v = 15 + (−10)(2) = 15 − 20 = −5 m/s, meaning the object is moving downward. Option A incorrectly adds the deceleration rather than subtracting it.

Answer

D. v = 15 × (10 × 2)

Answer

C. v = 15 × 2 − 10

Answer

A. v = 15 + (10 × 2)

Answer

B. v = 15 − (10 × 2)

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