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Man A is sitting in a car moving with a ...

Man A is sitting in a car moving with a speed of 54 `(km)/(hr)` observes a man B in front of the car crossing perpendicularly a road of width 15 m in three seconds. Then the velocity of man B (in `(m)/(s)`) will be:

A

`5sqrt()10` towards the car

B

`5sqrt()10` away from the car

C

5 m/s perpendicular to the road

D

None

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The correct Answer is:
B
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ALLEN -KINEMATICS-2D-Exercise (O-2)
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  2. A 2-m wide truck is moving with a uniform speed v(0)=8 m/s along a str...

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  3. Man A is sitting in a car moving with a speed of 54 (km)/(hr) observes...

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  4. A swimmer swins in still water at a speed =5 km//hr. He enters a 200m ...

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  5. A man wishes to swim across a river 40 m wide flowing with a speed of ...

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  6. An observer on ground sees a boat cross a river of width 800 m perpend...

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  7. A boatman moves his boat with a velocity 'v' (relative to water) in ri...

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  8. A ball is thrown at an angle theta up to the top of a cliff of height ...

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  9. A projectile of mass 1kg is projected with a velocity of sqrt(20)m//s ...

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  10. A particle is moving with a position vector, vec(r)=[a(0) sin (2pi t) ...

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  11. A point mass is moving in the x-y plane. Its acceleration is a constan...

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  12. A ball is thrown from ground such that it just crosses two poles of eq...

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  13. Position vector of a particle is expressed as function of time by equa...

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  14. A projectile is thrown with speed u into air from a point on the horiz...

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  15. A block is thrown with a velocity of 2m//s^(-1) (relative to ground) o...

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  16. A man on a rectilinearly moving cart, facing the direction of motion, ...

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  17. A cubical box dimension L = 5//4 m starts moving with an acceleration ...

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  18. A large rectangular box moves vertically downward with an acceleration...

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  19. In the figure there is a long horizontal bridge over a river 75 m high...

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  20. In the figure there is a long horizontal bridge over a river 75 m high...

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