The
acceleration due to gravity on the
Earth is 9.81 m/s2.
It is given the physics code g and
often the value is approximated to 10 m/s2.
(The latter approximation is perfectly acceptable in A-level
examinations.) All objects will
accelerate downwards at this rate, regardless of mass.
The drag is in the opposite direction to the weight, so the acceleration decreases.
Then the drag (upwards force)
balances the downward force (weight)
Therefore there is no acceleration and the speed is constant. This is terminal speed.
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