Question

A 4-kilogram ball moving at 8 m/sec to the right collides with a 1-kilogram ball at rest. After the collision, the 4-kilogram ball moves at 4.8 m/sec to the right. What is the velocity of the 1-kilogram ball?​

Answer 1

Explanation:

momentum is a constant

$4 \times 8 + 1 \times 0 = 4 \times 4.8 + 1 \times x$

$12.8 = 1 \times x$

$x = 12.8m {s}^{ - 1}$

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