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Question

A particle is projected with a velocity of 30 m/s at two angles of 30and 60 respectively. Then the ratio of their times of flight is
  1. 3:1
  2. 1:3
  3. 1:2
  4. 2:1


Solution

The correct option is B 1:3
 Time of flight, T=2usinθgT1=2usin30g and T2=2usin60g
Hence T1T2=sin30sin60T1T2=13
 

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