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]

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]

  1. A

    mu

  2. B

    2 mu

  3. C

    2 mu

  4. D

    22 mu

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    Solution:

    Speed of objects = u ms-1
    Since, 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

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