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asked in NEET by (2k points)
If retardation  produced by air resistance  of projectile is one tenth of accelaration  due to gravity  the time to reach the maximum  height  

Ans time decrease  by 9 percent

1 Answer

+2 votes
answered by (7k points)

If T is the time to reach maximum height in absence of air resistance then
T = u sinθ / g

If retardation is also considered then, then it will add to acceleration due to gravity
i.e. g → g + a

T' = u sinθ / g + a
u sinθ / g + (g/10)
= 10u sinθ/ 11g
= 10/11 T

percentage decrement = (actual decrement / actual time taken)x 100
= [(T - 10/11T)/ T] x 100 
= 1/11 x 100 = 9.09 %

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