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?
Given: 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.
To do: To find the velocity of the combined object after the collision.
Solution:
Mass of the object first $m_1=1.5\ kg.$
The velocity of the first object $v_1=2.5\ ms^{-1}$
Mass of the second object $m_2=1.5\ kg.$
The velocity of the second object $v_2=-2.5\ ms^{-1}$ [-ve sign indicates opposite direction]
According to the conservation of momentum,
$m_1v_1+m_2v_2=(m_1+m_2)V$ [Let $V$ be the final velocity of the combined object]
Or $1.5\times2.5+1.5\times(-2.5)=(1.5+1.5)V$
Or $0=3V$
Or $V=0$
Thus, the velocity of the combined object after the collision is zero.
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