Awaves amplitude is 0.5 meters. if the amplitude is increased to 1 metro, how does its energy change

Ais useful when you need a simple machine to you separate two things. a. lever b. screw c. pulley d. wedge

Samir watches a 100-minute movie on his spaceship. maria's spaceshipe flies in the same direction as samir's spaceship but she observes his move to last 125 minutes and his spaceship to be 40 m long. how long does samir observe his own spaceship to be? according to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does marias voyage take according to samir?

This is for my 8th grade science class, i really don’t understand. can someone me? , lol.