A girl walks from her house on a straight path to drop a letter in the letter-box. Then she returns to the origin point. Her displacementtime graph is shown in the figure, draw its velocity-time graph.


`to ` Slope of the graph OA = Velocity
`=(100-0)/(50-0)=+2ms^(-1) `
Slope of the graph AB = Velocity
`= (0- 100)/(100 - 50) =- 2ms ^(-1)`
`to `It is clear from the given displacement-time graph that the girl moves with constant positive velocity v from O to A. At point A for a moment her velocity becomes zero and moves back to origin (her house) at constant negative velocity by changing the

Explanation