How to change Newton\'s second law to third law?

1.	How to change Newton\'s second law to third law?
Answer» S=ut+1/2at"S=u[v-u/a s=ut+1/2at"s=u(v-u /a) +1/2a(u"+v"-2uv/a")s=uv-u/a + a(u"+v"-2uv)/2aas=uv-u"/a + (u"+v"-2uv) /2aS=2(uv-u")+(u"+v"-2uv) /2as=2uv-2u"+u"+v"-2uv/2as=v"-u"/2a2as=v"-u"

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