2.Motion in Straight Line
hard

यदि किसी कण का वेग $v = {(180 - 16x)^{1/2}}$ मी./सै. हो, तो इसका त्वरण .........$ms^{-2}$ होगा

A

$0$

B

$8 $

C

$-8 $

D

$4 $

Solution

(c) $v = {(180 – 16x)^{1/2}}$

चूँकि $a = \frac{{dv}}{{dt}} = \frac{{dv}}{{dx}}.\frac{{dx}}{{dt}}$

$\therefore a = \frac{1}{2}{(180 – 16x)^{ – 1/2}} \times ( – 16)\;\left( {\frac{{dx}}{{dt}}} \right)$

$ = – \;8\;{(180 – 16x)^{ – 1/2}} \times \;v$

$ = – \;8\;{(180 – 16x)^{ – 1/2}} \times \;{(180 – 16x)^{1/2}}$

$ = – \;8\;m/{s^2}$

Standard 11
Physics

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