4-1.Newton's Laws of Motion
medium

$5 \,ms^{-1}$ ના શરૂઆતના વેગથી $2\, kg$ નો પદાર્થ ગતિ કરે છે.તેના પર લાગતાં બળ વિરુધ્ધ સમયનો ગ્રાફ આપેલ હોય તો અંતિમ વેગ  .......... $m{s^{ - 1}}$ થાય.

A

$9.25$

B

$5$

C

$14.25$

D

$4.25$

Solution

(c)Impulse = Change in momentum $ = m({v_2} – {v_1})$ …(i)

Again impulse = Area between the graph and time axis $ = \frac{1}{2} \times 2 \times 4 + 2 \times 4 + \frac{1}{2}(4 + 2.5) \times 0.5 + 2 \times 2.5$

$ = 4 + 8 + 1.625 + 5$ $ = 18.625$…(ii)

From (i) and (ii), $m({v_2} – {v_1}) = 18.625$

$⇒$ ${v_2} = \frac{{18.625}}{m} + {v_1} = \frac{{18.625}}{2} + 5 = 14.25\;m/s$

Standard 11
Physics

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