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Relative Velocity

a lift perfor...

Question

a lift performs first part of uts ascent with uniform acceleration 'a' and the remaining with unform retardation '2a'.if 't' is the time of ascent ,find depth of shaft.

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Solution

$t_{1} = \frac{v}{a}, t_{2} = \frac{v}{2 a} a d d i n g t_{1} a n d t_{2} w e g e t t = \frac{3 v}{2 a} t = \frac{3}{2 a} \times \frac{2 h}{t} a t^{2} = 3 h, h = \frac{a t^{2}}{3}$

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