Q 11.     Two objects, each of mass 1.5 kg, are moving in the same straight line but in opposite directions. The velocity of each object is 2.5 m s-1 before the collision during which they stick together. What will be the velocity of the combined object after collision?

Answers (1)

The velocity of the combined mass after the collision will be zero.

This can be found using the law of conservation of the momentum :

$m_1u_1\ +\ m_2u_2\ =\ (m_1\ +\ m_2)v$

or                                              $mu\ +\ m(-u)\ =\ (2 m)v$

or                                                                    $2mv\ =\ 0$

Thus                                                                      $v\ =\ 0$

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