\(\therefore \frac{1}{2}m{(\upsilon + 2)^2} = 2 \cdot \frac{1}{2}m{\upsilon ^2}\,\)
\(\therefore {(\upsilon + 2)^2} = 2{\upsilon ^2}\,\,\therefore \upsilon + 2 = \sqrt 2 \upsilon \,\,\,\therefore \sqrt 2 \upsilon \,\, - \upsilon = 2\,\,\,\)
\(\therefore (\sqrt 2 - 1)\upsilon = 2\,\,\,\therefore \,\,\upsilon = \frac{2}{{(\sqrt 2 - 1}} \times \frac{{(\sqrt 2 + 1)}}{{(\sqrt 2 + 1)}}\,\,\, = \,2(\sqrt 2 + 1)\,\,\,\, = \,\,(2\sqrt 2 + 2)\,\,m/s\)
વિધાન $-2$ : સ્થિતિ સ્થાપક સંઘાતમાં તંત્રનું રેખીય વેગમાન સંરક્ષી હોય છે.