Spaceship A moves past the earth at 0.80c to the west. Spaceship B approaches A, moving to the east. Both spaceship crews measure their relative speed of approach to be 0.98c. What mass would the crews of both spaceships measure for the standard kilogram, kept at rest on the earth, (a) according to classical physics and (b) according to the special theory of relativity?

Spaceship A moves past the earth at 0.80c to the west. Spaceship B approaches A, moving to the east. Both spaceship crews measure their relative speed of approach to be 0.98c. What mass would the crews of both spaceships measure for the standard kilogram, kept at rest on the earth, (a) according to classical physics and (b) according to the special theory of relativity?

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