Question

Assertion :Corresponding to displacement- time graph of a particle moving in a straight line we can say that total work done by all the forces acting on the body is positive. Reason: Speed of particle is increasing.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

The slope of a distance-time graph determines the speed of that body, so steeper the slope greater will be the speed of the body.A flat horizontal line in a velocity-time graph states that the body is moving at a constant velocity. If the straight line has a slope, then that indicates the body is changing its velocity at a constant rate, or it means that the body has constant acceleration.

Hence we can say that if the speed of the particle is increasing the graph is a straight line and the forces acting on the body is positive.

Hence Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.