EWT | Academic Question

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Question (11)
QN0034910

The velocity of a projectile at the initial point  is  its velocity (in  ) at point  is

 

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: B
Explanation:

At point  the direction of velocity component of the projectile along -axis reverses.

Hence,

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Question (12)
QN0034911

A stone is projected horizontally with a  from the top of a plane inclined at an angle  with the horizontal. How far from the point of projection will the particle strike the plane?  

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

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Question (13)
QN0034912

A body is projected horizontally with velocity  from a height . It's horizontal range is 

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

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Question (14)
QN0034913

Two balls are projected at an angle  and  to the horizontal with the same speed. The ratio of their maximum vertical heights is

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

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Question (15)
QN0034914

A body is thrown with a velocity of  making an angle of  with the horizontal. It will hit the ground after a time

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: D
Explanation:

Time of flight

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Question (16)
QN0034915

The velocity of projection of a body is increased by . Other factors remaining unchanged, what will be the percentage change in the maximum height attained?          

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

We know that,

. Given

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Question (17)
QN0034916

A cricket ball is hit with a velocity  above the horizontal. How far above the ground, ball passes over a fielder  from the bat (conside: the ball is struck very close to the ground)? Take  and   

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: C
Explanation:

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Question (18)
QN0034917

A missile is fired for maximum range with an initial velocity of . If , the range of the missile is

  • (A)

  • (B)

     

  • (C)

  • (D)

Correct Answer: A
Explanation:

For maximum range, the angle of projection,

.

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Question (19)
QN0034918

A projectile can have the same range  for two angles of projection. If  and  be the times of flight in two cases, then what is the product of two times of flight?         

  • (A)

  • (B)

  • (C)

  • (D)

Correct Answer: A
Explanation:

and

,

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Question (20)
QN0034919

A particle of mass  is projected with a velocity  making an angle of  with the horizontal. The magnitude of   of the projectile when the particle is at its maximum height  

  • (A)

  • (B)

    zero

  • (C)

  • (D)

Correct Answer: D
Explanation:

where is the maximum height

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