Q27 / 126 · NTA Abhyas (NEET) 2020 · Physics · Motion In Two Dimensions

Two projectiles thrown from the same point at angles 60° and 30° with the horizontal attain the same height. The ratio of their initial velocities is

  • A
    1
  • B
    2
  • C
    3
  • Correct answer
    D
    13

Solution

hmax.=v2sin2θ2g

as  hmax. is same in both the cases

v12sin2θ12g=v22sin2θ22g

But θ1=60ο,  θ2=30ο

v 1 2 3 4 g = v 2 2 1 4 g

v 1 v 2 = 1 3

Hence, the correct answer is option: 'D'.

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