When a ball is let free fall from top of building. What is the acceleration and what i
t's sign?
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When a ball is let free fall from the top of the building then it's initial velocity will be 0 or it's acceleration will be +9.8 m/s^2.
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When a ball is allowed to free fall from the top of a building, the acceleration along with its direction is - 9.8 m/s².
- A ball falling from a height is pulled downwards by the gravitational force of the earth. Hence its direction is always downwards.
- The acceleration due to this force has a constant value and is equal to 9.8 m/s².
- By convention, the downward direction is taken as negative while the upward is taken as positive.
- Hence, in the given case the velocity and the acceleration of the fall are both negative (i.e. both are in a downwards direction).
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