Hello,
The slope of the tangent drawn on a velocity-time graph at a particular instant of time is equal to the instantaneous acceleration at that time. This is because the slope of the tangent line represents the rate of change of velocity with respect to time, which is the definition of acceleration.
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Question : If a body moves with a constant speed in a circle:
Option 1: no work is done on it
Option 2: no force acts on it
Option 3: no acceleration is produced
Option 4: its velocity remains constant
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