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Gravity is an attractive force that affects and is affected by all mass and - in general relativity - energy, pressure, and stress. Prefer newtonian-gravity or general-relativity if sensible.

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Draw the acceleration time graph of a body which thrown vertically upwards at 20 m/s and the...

Acceleration, a result of Earth's gravity acting on the body, can be considered to be constant. … Now, since gravity always points down and you defined the downward direction as negative, $\text{acceleration}=g=-9.8$ m/s2 (as you may know, $g$ here means the local value of acceleration due to gravity
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