Solve the all parts of given problem:
Problem: The space shuttle takes off from Cape Canaveral in Florida and orbits Earth 15 times before landing back at Cape Canaveral 24hours and 15 minutes later. During this time, it moves in a circular orbit with radius 6.7 x 106 m.
Part A: What is the average speed of the space shuttle during its journey?
Part B: What is the average velocity?
Include work and exact answer please! Thank you!