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Solve Its urgent Give scientific reasons. a. When an object falls freely to the ground. its acceleration is uniform. b. Even though the magnitudes of action torce and reaction force are equal and their directions ure opposite, their effects do not get cancelled. c. It is easier to stop a tennis ball as compared to a cricket ball, when both are travelling with the same velocity. d. The velocity of un object at rest is considered to be uniform.

The solution is as follows:

(a) When an object is falling freely, it is under the influence of gravitational force only and we know that this is the situation of free fall. Under free fall, acceleration remains uniform and it is denoted by "g". It is given as:

                      g = GMR2=9.8 m/s

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