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CBSE Class 11-science Answered

find time of flight
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Asked by preetiagrawal1979 | 22 Oct, 2020, 06:41: AM
answered-by-expert Expert Answer
Let u be the velocity of bullet when it is fired from the gun.
 
Time taken t for the bullet to travel a distance 60 m , t = 60 / u
 
Vertical distance h travelled in a time t is given as,  h = (1/2) g t2 
 
Since it is given that h = 8 cm ,  we have ,   8 × 10-2 = (1/2) × 9.8 × ( 60 / u )2 
 
From above equation, we get  u ≈ 470 m/s
 
Time of flight t = 60 /470 = 0.13 s
Answered by Thiyagarajan K | 22 Oct, 2020, 07:58: AM
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