Solve the each part of given question:
Question: A spaceship containing an astronaut travels at a speed of 0.50 c relative to a second inertial observer.
Part A: How much time does a clock on board the spaceship appear to lose in a day, according to the second observer?
Part B: What is the total energy of the astronaut according to the astronaut if her mass is 70kg?
Please show all work and steps I am really trying to learn this for my exam.