Home
Class 11
PHYSICS
A particle projected from the level grou...

A particle projected from the level ground just clears in its ascent a wall `30 m` high and `120sqrt3` away measured horizontally.The time since projection to clear the wall is two second.It will strike the ground in the same horizontal plane from the wall on the other side of a distance of (in metres)

A

`150sqrt3`

B

`180sqrt3`

C

`120sqrt3`

D

`210sqrt3`

Text Solution

Verified by Experts

The correct Answer is:
B
`x=u cos theta.t, y=u sin thetat-1/2"gt"^(2)`
`R=(2u cos theta.u sin theta)/g,x^(1)R-x`
Promotional Banner

Topper's Solved these Questions

  • MOTION IN A PLANE

    NARAYNA|Exercise Level-I (H.W)|41 Videos

  • MECHANICAL PROPERTIES OF SOLIDS

    NARAYNA|Exercise LEVEL-II (H.W)|24 Videos

  • MOTION IN A STRAIGHT LINE

    NARAYNA|Exercise Level 2 H.W|29 Videos

Similar Questions

Explore conceptually related problems

A shell fired from the ground is just able to cross horizontally the top of a wall 90 m away and 45 m high. The direction of projection of the shell will be.

A shell fired from the ground is just able to cross in a horizontal direction the top of a wall 90m away and 45m high. The direction of projection of the shell will be:

A particle is projected from a point on the level ground and its height is h when at horizontal distances a and 2 a from its point of projection. Find the velocity of projection.

A ball is thrown from the ground to clear a wall 3 m high at a distance of 6 m and falls 18 m away from the wall. Find the angle of projection of ball.

A ball is thrown from the ground to clear a wall 3 m high at a distance of 6 m and falls 18 m away from the wall the angle of projection of ball is :-

From a point on the ground at a distance of 2m from the fot of a verticle wal, a ball is thrown at an angle of 45^(@) which just clears the top of the wall and then strikes the ground at distance of 4m from the foot of the wall on the other side. The height of the wall is

A particle is projected from the ground at t = 0 so that on its way it just clears two vertical walls of equal height on the ground. The particle was projected with initial velocity u and at angle theta with the horiozontal. If the particle passes just grazing top of the wall at time t = t_1 and t = t_2 , then calculate. (a) the height of the wall. (b) the time t_1 and t_2 in terms of height of the wall. Write the expression for calculating the range of this projectile and separation between the walls.

A particle is projected from point O on level ground towards a smooth vertical wall 50m from O and hits the wall. The initial velocity of the particle is 30m/s at 45° to the horizontal and the coefficient of restitution between the particle and the wall is e. Find the distance from O of the point at which the particle hits the ground again if e = 0

NARAYNA-MOTION IN A PLANE-Level-II(H.W)
  1. The width of a river is 2sqrt3km.A boat is rowed in direction perpendi...

    Text Solution

    |

  2. Person aiming to reach the exactly opposite point on the bank of a str...

    Text Solution

    |

  3. A particle projected from the level ground just clears in its ascent a...

    Text Solution

    |

  4. A stone is projected with a velocity 20sqrt2 m//s at an angle of 45^(@...

    Text Solution

    |

  5. A ball is thrown with velocity 8 ms^(-1) making an angle 60^(@) with t...

    Text Solution

    |

  6. The range of a projectile launched at an angle of 15^(@) with horizont...

    Text Solution

    |

  7. A body is projected obliquely from the ground such that its horizontal...

    Text Solution

    |

  8. A projectile is thrown at angle beta with vertical.It reaches a maximu...

    Text Solution

    |

  9. The maximum height attained by a projectile is increased by 5%. Keepin...

    Text Solution

    |

  10. A gardener wants to wet the garden without moving from his place with ...

    Text Solution

    |

  11. A particle is projected with speed u at angle theta to the horizontal....

    Text Solution

    |

  12. From the top of a tower of height 78.4 m two stones are projected hori...

    Text Solution

    |

  13. A body is projected vertically upwards.At its highest point it explode...

    Text Solution

    |

  14. From the top of a building 80 m high, a ball is thrown horizontally wh...

    Text Solution

    |

  15. A stone is thrown from the top of a tower of height 50 m with a veloci...

    Text Solution

    |

  16. From the top of a tower of height 40m, a ball is projected upward with...

    Text Solution

    |

  17. A body is thrown horizontally with a velocity u from the top of a towe...

    Text Solution

    |

  18. A ball is projected with 20sqrt2 m//s at angle 45^(@) with horizontal....

    Text Solution

    |

  19. A particle is moving along a circular path in xy-plane.When its crosse...

    Text Solution

    |

  20. An insect trapped in a circular groove of radius 12 cm moves along the...

    Text Solution

    |