Two balls have masses 18 kg and 47 kg. The 18 kg ball has an initial velocity of 76 m/s (to the right) along a line joining the two balls and the 47 kg ball is at rest. They make a head-on elastic collision with each other. What is the final velocity of the 18 kg ball?

The final velocity of 18 kg ball is = 42.09

Explanation:

Mass of first ball = 18 kg

Mass of second ball = 47 kg

Initial velocity of 18 kg ball = 76

Initial velocity of 47 kg ball = 0

Final velocity of 18 kg ball = ??

Final velocity of 18 kg ball  is given by the formula

=

Put all the values in above formula we get

= 2 × 18 ×

= 42.09

Thus, the final velocity of 18 kg ball is = 42.09

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