A ball is thrown straight upward. How does the sign of the work done by gravity
ID: 1347112 • Letter: A
Question
A ball is thrown straight upward. How does the sign of the work done by gravity while the ball is traveling upward compare with the sign of the work done by gravity while the ball is traveling downward?
Work done by gravity is positive while the ball is traveling upward and negative while the ball is traveling downward. Work done by gravity is positive while the ball is traveling both upward and downward. Work done by gravity is negative while the ball is traveling upward and positive while the ball is traveling downward. Work done by gravity is negative while the ball is traveling both upward and downward.Explanation / Answer
when ball is travelling upward the displacement is upward & force of gravity is downward. the angle between displacement & force of gravity is 180 so the work done will be " negative "
when the ball is travelling downward the displacement is downward & the force of gravity is also downward. the angle between displacement & force of gravity is 0 so the work done will be " positive "
Work done by gravity is negative while the ball is travelling upward & positive while the ball is travelling downward.
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