Assertion : When an object moves at a constant velocity, then the displacement-time graph is a straight line inclined to time axis. Greater the inclination, higher will be the velocity. Reason : Greater the slope of the straight line, higher is the velocity. （ ） A . if both Assertion and Reason are true and Reason is the correct explanation of Assertion B . if both Assertion and Reason are true but Reason is not the correct explanation of Assertion C . if Assertion is true but Reason is false D . if both Assertion and Reason are false.

A The figure below shows the relationship between displacement and time.The slope of the displacement-time graph gives the velocity.Velocity, Line has a larger slope than line and hence it represents higher speed