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A stone is thrown from the top of a towe...

A stone is thrown from the top of a tower at an angle of ` 30^(@)` above the horizontal level with a velocity of 40 m/s. it strikes the ground after 5 second from the time of projection then the height of the tower is

A

20 m

B

25 m

C

40 m

D

55m

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The correct Answer is:
B
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AAKASH INSTITUTE-MOTION IN A PLANE-Assignement section -B Objective (one option is correct)
  1. One second after the projection, a stone moves at an angle of 45^@ wi...

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  2. The horizontal range of a projectile is R and the maximum height attai...

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

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  4. If the horizontal range of a projectile be a and the maximum height at...

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  5. A grasshopper can jump a maximum horizontal distance of 40cm. If it sp...

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  6. A body is projected horizontally with a speed v(0) find the velocity o...

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  7. A particle is thrown with the speed u at an angle alpha with the horiz...

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  8. A projectile is thrown with an initial velocity (v(x)hati + v(y)hatj) ...

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  9. A particle is projected with a velocity of 30 m/s at an angle theta...

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  10. A projectile has same range for two angules of projection. If times of...

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  11. A particle is projected with velocity 50 m/s at an angle 60^(@) with...

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  12. A projectile is fired to have maximum range 500 m. Maximum height atta...

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  13. A particle projected at some angle with velocity 50 m/s crosses a 20 m...

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  14. Two paper screens A and B are separated by a distance of 100m. A bulle...

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  15. A stone is thrown from the top of a tower at an angle of 30^(@) above...

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  16. A level flight olane flying at an altitude of 1024 ft with a speed of ...

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  17. A particle is projected from the bottom of an inclined plane of inclin...

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  18. A man desires to swim across the river in shortest time. The velocity ...

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  19. Two cars A and B cross a point P with velocities 10m//s and 15m//s. Af...

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  20. A man can swim at 4 m/s in a still water swimming pool. He enters a ...

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