Again Consider Two Twin Sisters,Gwen and Jackie,who Are Both 20

question 30

Multiple Choice

Again consider two twin sisters,Gwen and Jackie,who are both 20 years old in the year 2020.This time,assume that Jackie makes the round-trip to Vega,which is 25 light-years away,at an average speed of 0.9999c.Which of the following correctly describes the situation when Jackie returns to Earth? (Ages in this problem refer to biological ages-that is,how much time has passed for each sister since she was born. )

• A)It's the year 2070.Gwen (who stayed home)is 70 years old,but Jackie is only a little older than her age of 20 when she left.
• B)It's the year 2070 and both twin sisters are 70 years old.
• C)It's the year 2070.Gwen is 70 years old.Jackie is 19.
• D)According to Gwen,Jackie returns to Earth in the year 2070,but according to Jackie,she returns in the year 2021.

---

Definitions:

Canceling Order

An instruction to cancel a previously issued order before it is executed, commonly used in trading and procurement.

Express Repudiation

The clear and unequivocal refusal to perform one's obligations under a contract.

Anticipatory Breach

Occurs when one party to a contract indicates, either through their actions or words, that they will not fulfill their contractual obligations, allowing the other party to seek remedies before the breach actually occurs.

Performance Date

The specified day by which a contractual agreement, task, or duty must be completed.