Suppose you stay home on Earth and watch a spaceship that leaves on a long trip

Suppose you stay home on Earth and watch a spaceship that leaves on a long trip at a constant acceleration of 1g.
a.  At an acceleration of 1g, approximately how long will it take before you see the ship traveling away from Earth at half the speed of light? Explain. (Use g  =  9.8 m/ .)
b.  Describe how you will see its speed change as it continues to accelerate. Will it keep gaining speed at a rate of 9.8 m/s each second? Why or why not?
c.  Suppose the ship travels to a star that is 500 light-years away. According to you back on Earth, approximately how long will this trip take? Explain.