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If the first one - third of q journey is...

If the first one - third of q journey is travelled at 20 km `h^(-1)` , Next one - third at `40 km h^(-1)` And the last one third at `60 km h^(-1)` then the average speed for the whole journey will be

A

`32.7 km//h`

B

`35 km//h`

C

`40 km//h`

D

`45 km//h`

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SL ARORA-MECHANICS-Exercise
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  2. A car travels from A to B at a speed of 20 km//hr and returns at a spe...

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  3. If the first one - third of q journey is travelled at 20 km h^(-1) , ...

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  4. A person travelling on a straight line moves with a uniform velocity v...

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  5. A 100 m long train is moving with a uniform velocity of 45 km//hr. ...

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  6. You drive a car at a speed of 70 km//h in a straight road for 8.4 km, ...

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  7. A car moving with a speed of 25 ms^(-1) takes a U-turn in 5 seconds, ...

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  8. A particle moves along the x-axis with a position given by the equatio...

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  9. The motion of a particle is described by the equation at u = at.The di...

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  10. The acceleration a of a particle starting from rest varies with time a...

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  11. Given a = 2t + 5. Calculate the velocity of the body after 10 sec if i...

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  12. With the usual notations the following equation S(t)=u+1/2a(2t-1) is

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  13. What is the relation between displacement, time and acceleration in ca...

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  14. A body sliding down on a smooth inclined plane slides down 1//4th dist...

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  15. A particle moving in one dimension with a constant acceleration of 2 m...

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  16. A particle starts from rest, accelerates at 2(m)/(s^2) for 10 s and th...

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  17. The velocity of a particle at an instant is 10 m s^(-1). After 3 s its...

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  18. A particle starts from rest with uniform acceleration a. Its velocity...

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  19. A car accelerates from rest at a constant rate for some time after wh...

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  20. The velocity with which a body stricks the ground is always equal to ...

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