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A car moves from X to Y with a uniform s...

A car moves from `X` to `Y` with a uniform speed `v_u` and returns to `Y` with a uniform speed `v_d`. The average speed for this round trip is :

A

`sqrt(v_u v_d `.

B

`frac(v_d v_u)(v_d+v_u)`

C

`(v_u+v_d)/(2)`.

D

`(2v_d v_u)/(v_d+v_u)`.

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SL ARORA-MECHANICS-Exercise
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  2. A bus travelled the first one-third distance at a speed of 10 km//h, t...

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  3. A car moves from X to Y with a uniform speed vu and returns to Y with ...

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  4. A particle covers half of its total distance with speed v1 and the res...

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  5. A car moves along a straight line whose equation of motion is given by...

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  6. A particle moves along a straight line AB. At a time t (in seconds) th...

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  7. The position x of a particle varies with time t as x=at^(2)-bt^(3). Th...

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  8. Motion of particle is given by equation s=(3t^(3)+7t^(2)+14t+8)m T...

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  9. A particle moves along a staight line such that its displacement at an...

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  10. The motion of a particle along a straight line is described by equatio...

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  11. A particle move a distance x in time t according to equation x = (t + ...

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  12. A particle of unit mass undergoes one-dimensional motion such that its...

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  13. The displacement x of a particle varies with time t as x = ae^(-alpha ...

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  14. The position x of a particle with respect to time t along x-axis is gi...

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  15. The deceleration exerienced by a moving motor blat, after its engine i...

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  16. A particle moving along x-axis has acceleration f, at time t, given by...

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  17. The acceleration of a particle is increasing linearly with time t as b...

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  18. If a car at rest, accelerates uniformly to a speed of 144 km//h in 20s...

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  19. The velocity of train increases uniformly from 20 km/h to 60 km/h in 4...

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  20. A car moving with a speed of 40 km//h can be stopped by applying the b...

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