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13. A spaceship leaves Earth traveling at 0.75 c. A second spaceship leaves the first at...

13. A spaceship leaves Earth traveling at 0.75 c. A second spaceship leaves the first at a speed of 0.89 c with respect to the first.

Part A Calculate the speed of the second ship with respect to Earth if it is fired in the same direction the first spaceship is already moving. Take the positive direction in the direction of the first spaceship. Express your answer using two significant figures.

Part B Calculate the speed of the second ship with respect to Earth if it is fired directly backward toward Earth.

Express your answer using two significant figures.

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