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Q.

Is it true that if an external unbalanced force acts on an object, then the speed of it changes with time?


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a

True

b

False 

answer is A.

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Detailed Solution

The above statement is true.
Speed of an object changes with time if an external unbalanced force acts upon it. This is because an unbalanced force is required to change the state of motion of an object. If no unbalanced force acts on an object, it remains at rest or continues to move along a straight-line path with uniform velocity.
 
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