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A stone is dropped from a height 100m above the ground ...will it have uniform or non-uniform speed as it moves towards the ground....And please explain your answers.....

A falling stone will increase in speed until it reaches it's terminal velocity, the speed when the downward force of gravity equals the upward force of drag, which causes the net force on the stone to equal zero, thus achieving an acceleration of zero.If atmosphere is ignored, a falling body will accelerate at 32ft/s (9.75m/s). The distance traveled in the first second would be 16 feet (4.87m), in the second second: 48 feet (14.63m) and in the third second: 80 feet (24.38m); hence after three seconds an object would have fallen 144 feet (43.89 meters) and is traveling at 96ft/s (29.26m/s).

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This is neither uniform nor non-uniform speed. It is free fall as it is pulled by the gravitational force of the earth.

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Aditya thanks for the answer.....but please tell me how you have calculated the speed without knowing the mass of the stone....???

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It has uniform speed.

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A stone dropped from the height of 100 m  has non - uniform motion because the stone will not cover equal distance in equal intervals of time. The speed increases .
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BUT AS PER GALILEO  IT IS A FREE FALL. WHICH MEANS GRAVITIONAL PULL BY THE EARTH.
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Uniform. Because when an object is dropped it is dropped in a straight manner.
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It is a nonuniform motion because speed increases with time
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