Per NCERT, taking UPWARD as positive y-axis, what is the sign of acceleration during FREE FALL?
A+g
BVariable sign
CZero
Da = −g = −9.8 m/s² (downward is negative when up is positive)
Answer & Solution
Correct answer: D. a = −g = −9.8 m/s² (downward is negative when up is positive)
Per NCERT Example 2.4, with up = positive, free-fall acceleration is −g. Always downward.
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