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4-1.Newton's Laws of Motion
easy
$m $ દળવાળા કોઇ કણ પર લગાડેલ બળ નીચે દર્શાવેલ બળ-સમયના આલેખ દ્વારા દર્શાવેલ છે . $0$ $8$ સેકન્ડ સુધીના ગાળામાં કણના વેગમાનમાં થતો ફેરફાર ($N-s$ માં) કેટલો હશે?
A
$24$
B
$20$
C
$12 $
D
$6$
(AIPMT-2014)
Solution
$\begin{array}{l}
Chenge\,in\,momentum\, = Area\,under\,F – graph\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,in\,that\,{\rm{interval}}\\
\,\,\,\,\,\,\, = Area\,of\,\Delta ABC – Area\,of\,{\rm{rectangle}}\,CDEF\\
\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\, + Area\,of\,{\rm{rectangle}}\,{\rm{FGHI}}\\
\,\,\,\,\,\,\, = \,\frac{1}{2} \times 2 \times 6 – 3 \times 2 + 4 \times 3 = 12\,N\,s
\end{array}$
Standard 11
Physics
