When we calculate the work-done by gravity which is mgh. Pl. clarify that we have to take h always positive i.e absolute value.
Asked by VENIKA SINGHAL | 4th Sep, 2011, 12:00: AM
We take height as always positive because we take the displacement above ground as positive (for conveninence you may remember that it is also the direction of + y-axis).
Answered by | 4th Sep, 2011, 09:04: PM
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