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A particle is projected in the x-y plane...

A particle is projected in the x-y plane with y-axis along vertical. Two second after projection the velocity of the particle makers an angle `45^(@)` with the X-axis. Four second after projection. It moves horizontally. Find velocity of projection.

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The correct Answer is:
`20sqrt()5m//s`
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ALLEN -KINEMATICS-2D-Exercise (S-1)
  1. A particle is projected in x-y plane with y-axis along vertical, the p...

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  2. Show that projection angle theta(0) for a projectile launched from the...

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  3. A particle is projected in the x-y plane with y-axis along vertical. T...

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  4. A ball is thrown horizontally from a cliff such that it strikes the gr...

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  5. A Bomber flying upward at an angle of 53^(@) with the vertical release...

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  6. A ball is projected at an angle of 30^(@) above with the horizontal fr...

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  7. A ball is dropped from rest from a tower of height 5m. As a result of ...

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  8. A tank is initially at a perpendicular distance BT=360 m from the plan...

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  9. A Rajput soldier sits on a horse next to a river. Across the river the...

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  10. A ball is projected on smooth inclined plane in direction perpendicula...

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  11. A ball is thrown horizontally from a point O with speed 20 m/s as show...

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  12. A person decided to walk on an escalator which is moving at constant r...

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  13. On a frictionless horizontal surface , assumed to be the x-y plane ,...

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  14. A cuboidal elevator cabon is shown in the figure. A ball is thrown fro...

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  15. Two particles are thrown simultaneously from points A and B with veloc...

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  16. A man crosses a river in a boat. If he cross the river in minimum time...

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  17. Rain is falling vertically with a speed of 20ms^(-1)., A person is run...

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  18. A glass wind screen whose inclination with the vertical can be changed...

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  19. Boat moves with velocity 5 m/s on still water. It is steered perpendic...

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  20. Velocity of the boat with respect to river is 10 m/s. From point A it ...

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