Question

why does the speed of an object change with time ? motion required cause ? if so what is the nature of this cause?​

Answer 1

Answer:

This is again because of the friction forces acting opposite to the direction of motion. ... Thus, to accelerate the motion of an object, an unbalanced force is required. And the change in its speed (or in the direction of motion) would continue as long as this unbalanced force is applied.

Explanation:

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