SOMEONE PLEASE HELP ME!!
If the relative positions of the sun and moon affect the oceans tides, why would it be smart for sailors and other people who work on the ocean to understand patterns in the earth-sun-moon system?

To know when it is safe to be in the ocean!

Explanation:

hope this helps :)

If they understand the Ocean they would most likely go in the correct direction and not get stranded or lost in the middle of the Ocean or Sea

Explanation: If you don't know your way Around a place like a new house then you will most likely.

at positions a, g kinetic energy is maximum.

at position d, potential energy is maximum.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me