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4-1.Newton's Laws of Motion
medium
$0.1 \,kg$ ના પદાર્થનો સ્થાન વિરુધ્ધ સમયનો ગ્રાફ આપેલ છે.તો $2\, sec$ એ બળનો આધાત .......... $kg\,m\,{\sec ^{ - 1}}$ થશે.
A
$0.2$
B
$-0.2$
C
$0.1$
D
$-0.4$
Solution
(b) Velocity between $t = 0$ and $t = 2\sec $
$⇒$ ${v_i} = \frac{{dx}}{{dt}} = \frac{4}{2} = 2\;m/s$
Velocity at t$ = 2\sec $, ${v_f} = 0$
Impulse = Change in momentum $ = m({v_f} – {v_i})$
$ = 0.1(0 – 2)$ $ = – 0.2\;kg\;m\;{\sec ^{ – 1}}$
Standard 11
Physics
