A ball with a mass of #4 kg # and velocity of #4 m/s# collides with a second ball with a mass of #2 kg# and velocity of #- 1 m/s#. If #15%# of the kinetic energy is lost, what are the final velocities of the balls?
1 Answer
Final velocities of balls are
Explanation:
As the velocity of first ball is
Let the final velocity of firrst ball be
Conservation of momentum - As momentum is always conserved, the initial momentum is equal too final momentum.
Hence
i.e.
i.e.
Further initial kinetic energy is
and final kinetic energy is
and as it is
putting value of
or
and
=
=
and using (1),
However, second ball cannot move with a velocity of
and hence final velocities of balls are