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4-1.Newton's Laws of Motion
hard

 $ m_1 = 4m_2$  અને $m_1 $ નો પ્રવેગ $a$ છે. $m_2$ એ $0.4\,s$ સમયમાં ........ $cm$ અંતર કાપ્યું હશે.

A

$40$

B

$20$

C

$10$

D

$80$

Solution

${m_1}a = {m_1}g – 2T$ …..(i)

${m_2}\left( {2a} \right) = T – {m_2}g$…..(ii)

$a = g/4$

સ્થિર થવા લાગતો સમય $t = \sqrt {\frac{{2h}}{a}} \, = \,\sqrt {\frac{{2 \times 0.2}}{{g/4}}} \, = \,\sqrt {\frac{{2 \times 0.2}}{{2.5}}} $$ = 0.4\,\sec $

$S = 2 \times 20 = 40\, cm$

Standard 11
Physics

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