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A stone is projected from the top of a t...

A stone is projected from the top of a tower with velocity `20ms^(-1)` making an angle `30^@` with the horizontal. If the total time of flight is 5s and `g= 10ms^(-2)`

A

the height of the tower is 75m

B

the maximum height of the stone from the ground is 80m

C

both of the above are true

D

none of the above is true

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The correct Answer is:
C
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AAKASH SERIES-RIVISION EXERCISE-MOTION IN A PLANE (OBLIQUE PROJECTION)
  1. A body projected at 45^@ with a velocity of 20 m/s has a range of 10m...

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  2. Two seconds after projection, a projectile is moving at 30^@ above th...

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  3. A stone is projected from the top of a tower with velocity 20ms^(-1) ...

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  4. A cricket fielder can throw the cricket ball with a speed v0 . If the ...

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  5. A boy can throw a stone up to a maximum height of 10m. The maximum hor...

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  6. A particle is projected from the ground with an initial speed of v at ...

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  7. A ball is projected with 20sqrt2 m/s at angle 45^@ with horizontal, th...

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  8. The direction of projectile at certain instant is inclined at angle a ...

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  9. Two bodies are projected from the same point in the directions making ...

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  10. If v1 and v2 be the velocities at the end of focal chord of projectile...

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  11. A projectile fired with velocity u at right angle to the slope which i...

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  12. A projectile is thrown at an angle of 30^@ with a velocity of 10m/s. ...

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  13. A body projected obliquely with velocity 19.6 ms^(-1) has its kineti...

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  14. It is possible to project a particle with a given speed in two possibl...

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  15. The range of a projectile, when launched at an angle of 15^@ with the...

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  16. A ball A is projected from the ground such that its horizontal range i...

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  17. A particle is projected from the ground with velocity u making an angl...

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  18. A projectile has the maximum range of 400m. If it is pushed up smooth ...

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  19. A hose pipe lying on the ground shoots a stream of water upward at an ...

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  20. From a point on the ground at a distance 2m from the foot of a vertica...

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