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CBSE Class 9 Answered

A stone is thrown up with an initial speed v0. There is a resisting acceleration k(v^1/2) due to air, where v is instantaneous velocity and k is some positive constant. Find the time taken to reach the highest point and the maximum height attained by the particle.(neglect acceleration due to gravity)
Asked by Mayank Gupta | 18 Jun, 2011, 02:46: AM
answered-by-expert Expert Answer

Using first equation of motion

v’ = u - a t

Where v’ is the speed at highest point and t is the time to reach that point. As acceleration due to gravity is neglected, then  

0 = v0 - k(v^1/2) t

t = v0 / k(v^1/2)

Let H is the maximum height attained by the stone then,

v’2 = u2 – 2aH

0 = (v0)2 – 2 k(v^1/2) H

H = (v0)2 / 2 k(v^1/2)

Answered by | 21 Jun, 2011, 09:23: AM

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