Energy could best be defined as
A) stored momentum.
B) the amount of force a system is capable of exerting.
C) matter in motion.
D) the capacity to do work.
E) the ability to exert power.
Question 2
Velma passes Mort at a speed of 0.75c. At this speed, the time dilation factor is 1.5. In other words, Mort observes a 1-second tick of Velma's clock to take 1.5 seconds.
Suppose that they are born at the same time, and that Velma observes herself to live 30 years. According to Mort's observations, how old is he when Velma dies?
A) 10 years B) 30 years C) 20 years D) 40 years E) 45 years
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