Whatbis the sign of velocity when a ball move downwards?
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The sign convention mainly depends upon the direction which you are taking a positive .For example if you take upward direction as positive then the downward direction will be negative and vice - versa.
Generally upward direction is taken as positive and downward direction as negative.
harjas2060:
then if we throw ball upwards then iys velocity will be positive?
it depends on u which direction u take positive
if i take upward direction as positive then our velocity acceleration will also be positive?
ya
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