InterviewSolution
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InterviewSolution
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A car is moving along a straight (OP). It moves from `O "to" P` in `18 seconds` and returns from `P "to" Q` in 6 seconds, where `OP=360 m` and `OQ=240 m` What are the car the average velocity and average speed of the car in going (a) from `O "to" P` and back to `Q`? |
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Answer» (a) For a motion from `O to P`, Displacement `=360 m` and path length `=360 m` Average velocity`= (displacement) /(time) =(360 m)/(18s)` `=20 ms^(-1)` along `vec (OP)` Average speed `=(path length)/(time)` `=(360 m)/(18 s) = 20 ms^(-1)` (b) For a motion from `O to P` and back to `Q , displacement`=OQ =24 0 m` path length `=OP +PQ =360 + (360 +(360 -240)` `=360 +120 =480 m` Average velocity `=(240)/(18+6)` `= 10 ms^(-1)` along `vec (OP)` Average speed `=(480)/(18 +6) =20 ms^(-1)`. |
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