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A ball is thrown vertically upward. If upward is taken as positive, which statement is correct for its motion under gravity?
AIts acceleration is $+g$ throughout the motion
BIts acceleration is $-g$ throughout the motion
CIts acceleration is zero at the highest point only
DIts acceleration changes from $-g$ to $+g$ during descent
Answer & Solution
Correct answer: B. Its acceleration is $-g$ throughout the motion
Gravity acts downward at all times. If upward is positive, the acceleration due to gravity is negative, so the ball has acceleration $-g$ throughout ascent, at the top, and during descent.
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