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| 1. |
A car is moving along a straight line, say OP in It move from O to P in 18 s and returns from P to Q in6 s, where OP=360 m and OQ=240 m. What are the average velocity and average speed of the car in going (a) from O to P ? And (b) from O to P and back to Q ? |
| Answer» <html><body><p></p>Solution :<img src="https://d10lpgp6xz60nq.cloudfront.net/physics_images/KPK_AIO_PHY_XI_P1_C03_E02_001_S01.png" width="80%"/> <br/> (a) Average <a href="https://interviewquestions.tuteehub.com/tag/velocity-1444512" style="font-weight:bold;" target="_blank" title="Click to know more about VELOCITY">VELOCITY</a> `= ("Displacement")/("Time taken")` <br/> `bar v = (360- <a href="https://interviewquestions.tuteehub.com/tag/0-251616" style="font-weight:bold;" target="_blank" title="Click to know more about 0">0</a>)/(18) = (360)/(18)` <br/> `therefore bar v = <a href="https://interviewquestions.tuteehub.com/tag/20-287209" style="font-weight:bold;" target="_blank" title="Click to know more about 20">20</a> ms ^(-1)` <br/> Average speed `= ("Path length")/("Time taken")` <br/> `= (360)/(18) = 20 ms ^(-1)` <br/> `therefore` The value of Average speed is same as Average velocity <br/> (<a href="https://interviewquestions.tuteehub.com/tag/b-387190" style="font-weight:bold;" target="_blank" title="Click to know more about B">B</a>) Average velocity `= ("Displacement <a href="https://interviewquestions.tuteehub.com/tag/oq-583888" style="font-weight:bold;" target="_blank" title="Click to know more about OQ">OQ</a>")/(18 +6)` <br/> ` = (240)/(24) ` <br/> `bar v = 10 ms ^(-1)` br> Average speed `= ("Path length")/("Time taken")` <br/> `= (OP+ PQ)/(18+6)= (360+ 120)/(24) = (480)/(24) = 20 ms ^(-1)` <br/> Here, Average speed `gt ` Average velocity,</body></html> | |