A particle is in straight line motion with uniform velocity. A force is not required:
To increase the speed
To decrease the speed
To keep the same speed
To change the direction.
As we learned
Inertia is the property of a body by which it continues to remain in its existing state of rest or uniform motion in a straight line unless an external force acts on it.
A body cannot change its state on its own.
So To keep the same speed A force is not required.
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