Two objects of mass m each moving with speed u ms-1 collide at 90°, then final momentum is (assume collision is inelastic) [JIPMER 2019]

Speed of objects = u ms-1Since, both objects collide at 90°.Hence, by the law of conservation of momentum,Total momentum before collision                                   = Total momentum after collision                     |mui^+muj^|=pf                     m2u2+m2u2=pf⇒                                    pf = 2 mu