Answer:
7.39 m/s is the velocity of the cue ball after impact.
Explanation:
Given that,




We know that,
If two objects collide then the “total momentum” before is equal to the “total momentum” after collision.

Substitute the given values in the formula.



Atomic mass can change through the process of fusion. Another way is, it can also change in nuclear fusion.
Crops need sunlight to grow as well as water.
Reduced sunlight means reduced growth rate of crops means reduced crop yield means reduced number of mouths each yield can feed means famine means death.
Answer:
Conservation of angular momentum
Explanation:
When the objects spread in universe after big bang, because of the tremendous force , they gained angular momentum and started to rotate. Since, then the object continue to rotate on their axis because of conservation of angular momentum. In vacuum of space there no other forces that can stop these rotation, therefore, they continue to rotate.