Question:

For a given angle of projection, if the time of flight of a projectile is doubled, the horizontal range will increase to :

Updated On: Jul 5, 2022
  • four times
  • thrice
  • once
  • twice
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The Correct Option is A

Solution and Explanation

The formula for time of flight and horizontal ray is given by as $g T^{2}=2 R \tan \alpha$ $\Rightarrow R \propto T^{2} \ldots $ (l) From the relation (1), if $T$ is doubled then $R$ will be four times
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Concepts Used:

Motion in a Plane

It is a vector quantity. A vector quantity is a quantity having both magnitude and direction. Speed is a scalar quantity and it is a quantity having a magnitude only. Motion in a plane is also known as motion in two dimensions. 

Equations of Plane Motion

The equations of motion in a straight line are:

v=u+at

s=ut+½ at2

v2-u2=2as

Where,

  • v = final velocity of the particle
  • u = initial velocity of the particle
  • s = displacement of the particle
  • a = acceleration of the particle
  • t = the time interval in which the particle is in consideration