If the upward direction is taken as positive what is the sign of velocity and acceleration when a body falls freely from a height.

positive acceleration and positive velocity

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positive acceleration and negative velocity

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negative acceleration and positive velocity.

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negative acceleration and negative velocity

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Solution

The correct option is D
negative acceleration and negative velocity

Both velocity and acceleration are in the downward direction. Thus, they will be considered negative as they are vectors and the upward direction is positive.

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A sign convention is used, the positive direction for position, velocity and acceleration is upward. A ball of mass m is thrown upward with velocity $V$ and caught during returning. Identify the signs of position, velocity and acceleration during ascending part of the trajectory.

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(A)	Positive	Positive	Positive
(B)	Positive	Positive	Negative
(C)	Positive	Negative	Negative
(D)	Negative	Positive	Negative
(E)	Negative	Negative	Negative

A body is projected vertically upward direction from the surface of earth. If upward direction is taken as positive, then acceleration of body during its upward and downward journey are respectively

Ans:- negative, negative

Please explain why is this so?????

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If the upward direction is taken as positive what is the sign of velocity and acceleration when a body falls freely from a height.

The correct option is D negative acceleration and negative velocity Both velocity and acceleration are in the downward direction. Thus, they will be considered negative as they are vectors and the upward direction is positive.

The correct option is D
negative acceleration and negative velocity

Both velocity and acceleration are in the downward direction. Thus, they will be considered negative as they are vectors and the upward direction is positive.