Home › CBSE Class 11 › Physics › Motion in a Straight Line › Per NCERT, taking UPWARD as positive y-axis, wha…
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.
Related questions
A ball is thrown up with initial velocity $u$. It reaches its highest point at time:For a ball thrown vertically upwards and returning to the ground, the velocity-time graph:Displacement differs from distance in that displacement:For uniform motion, velocity is represented by the gradient of a:Which quantities need a sign convention fixed before they are assigned values?In uniform motion, how does instantaneous velocity vary with time?Why can average speed exceed the magnitude of average velocity?Speed differs from velocity in that speed does not carry: