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STD 11 - 2. motion in straight line — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 2. motion in straight line4 Marks
Question
Two points move in the same straight line starting at the same moment from the same point in it. The first moves with constant velocity $u$ and the second with constant acceleration $f$. During the time elapses before the second catches, the first greatest distance between the particle is $........$
✓

Answer

(b)

The greatest distance, when velocities of both are equal.

$\text { or } \quad f t=u$

$t=\frac{u}{f}$

$s_1=u t=\frac{u^2}{f}$

and

$s_2=\frac{1}{2} f t^2=\frac{u^2}{2 f}$

$\therefore \quad s_{\max }=s_1-s_2=\frac{u^2}{2 f}$

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