Aspaceship is moving in a straight line away from earth at 0.80c, measured relative to earth. it launches a missile that moves away from the spaceship in the forward direction at 0.60c, relative to the ship. relative to earth, what is the speed of this missile?

a. c
b. greater than c but less than 1.4c
c. 1.4 c
d. greater than 0.80c but less than c

The electric field between square plates of a parallel-plate capacitor has magnitude e. the potential across the plates is maintained with constant voltage by a battery as they are pulled apart to twice their original separation, which is small compared to the dimensions of the plates. the magnitude of the electric field between the plates is now equal to a)e b)e/4 c)e/2 d)4e e)2e