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An elavator is going up vertically with ...

An elavator is going up vertically with a constant accelerartion of `2m//s^(2)`. At the instant when its velocity is `4m//s` a ball is projected from the floor of the elavator with a speed of `4m//s` relative to the floor with an angular eleavation of `60^(@)`. The time taken by the ball to return the floor is `(g=10m//s^(2))`

A

`1/3s`

B

`1/(sqrt(3))s`

C

`2/(sqrt(3))s`

D

`sqrt(3)s`

Text Solution

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The correct Answer is:
B
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DC PANDEY ENGLISH-KINEMATICS-SCQ_TYPE
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  5. A projectile is fired at an angle of 30^(@) to the horizontal such tha...

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  6. A particle starts from the origin of coordinates at time t = 0 and mov...

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  7. The speed of a projectile when it is at its greatest height is sqrt(2/...

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  8. After one second the velocity of a projectile makes an angle of 45^(@)...

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  9. A particle is projected with a certain velocity at an angle alpha abov...

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  10. Time taken by the particle to reach from A to B is t. Then the distanc...

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  11. A projectile of mass 2kg has velocities 3m//s and 4m/s at two points d...

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  12. With what minimum speed must a particle be projected from origin so th...

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  13. A particle is projected from a point A with velocity sqrt(2)u an angle...

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  14. A projectile is thrown with a velocity of 10sqrt(2)m//s at an angle of...

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  17. Trajectory of two particles projected from origin with speeds v(1) and...

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  18. Two inclined planes OA and OB of inclinations alpha and beta equal to ...

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  19. An elavator is going up vertically with a constant accelerartion of 2m...

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  20. Two children are playing a game in which they try to hit a small box u...

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