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CBSE - XI Science - Physics - Motion in a Plane

Respected Ma'am I am Saurabh of class 11.I wanted to ask a question related to projectile motion.My question is Why do we take gravitation as negative in projectile it should be taken positive because the body during its filght is always under influence of gravitaion and also that finally it acts in direction the gravitation is.then it should be taken positive right???????????

Asked by saurabh parnerkar 17th February 2011, 12:00 AM
Answered by Expert


Dear student,
It is negative if the upwards direction is defined as positive. Acceleration is downward.
The sign for the acceleration of gravity depends on which direction you choose to be positive for the vertical axis.If the positive direction is defined to be up (the usual convention), then the acceleration of gravity is negative (the acceleration vector points downwards, in the negative direction for the vertical axis).
Hope this helps.
Answered by Expert 17th February 2011, 3:08 PM

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