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## Homework Statement

A spacecraft with its astronaut has a total mass at rest of 10^5 kg. The astronaut is to travel to a star 10 light years away at a speed such that she only ages 1 year in her frame of reference

a) the quantity 1-v/c where v is her speed with respect to earth is?

b) the total energy required to accelerate the spacecraft from rest to this velocity in units of 10^22 Joules is?

## Homework Equations

## The Attempt at a Solution

1 year = 356 days = 1.89 x 10^9

I tried converting 10 light years into km

Then tried using v = d/t to find V