Some dogs may inherit a susceptibility to epilepsy.
Answer:
the light waves bend or REFRACT
Explanation:
It conserves both energy and momentum in the collision at the same time. By design, when the balls collide the strings that hold them up are vertical (assuming balls are only swung from one side).
: Hope this helps :)
Vs - velocity on beginning
ve - velocity on ending. You've got:

So he needed 4 second.