In NCERT Textbook Class 9 (Pg.136) It Is Given That When A Body Is Travelling In Upward Direction, G=-9.8m/S2.But In NCERT Textbook Class (11 Pg 49) It Is Given That When A Body Is Thrown In Upward Direction, G=+9.8m/S2. Can You Please Explain?

Asked by  | 18th Aug, 2012, 07:20: AM

Expert Answer:

In every case the acceleration due to gravity is same.
It always acts in downward direction. The sign depends on the direction in which this force is acting.
Suppose a body is falling then the acceleration due to gravity will aid in the motion, so we use a positive sign for it, otherwise for  a body travelling upwards, we use a negative sign as it decellerates the motion

Answered by  | 18th Aug, 2012, 09:13: AM

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