Question

why is ''g'' (acceleration due to gravity) taken negative in projectile motion

Answer 1

Suppose the question states that a projectile is thrown from the ground, goes to a certain and height and returns.
G is taken as negative only for the part where the body is opposing the force of gravity (when it is being thrown up). This is because G does not act in the direction of motion,and hence is taken as negative. Something easy to think about it when you throw something, up is taken as negative g, and down is taken as positive g(because when the body is falling down from the height it reaches after being thrown, the motion no longer opposes gravity, and in this case, g is taken as positive)

Answer 2

Explanation:

But this negative sign represents only the direction of acceleration due to gravity, it does not represent a 'negative value' of acceleration. So, 'g' is negative in projectile motion because the direction of 'g' is opposite to the positive direction defined.

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