Chapter 27, Problem 16P

An enemy spaceship is moving toward your starfighter with a speed of 0.400c, as measured in your reference frame. The enemy ship fires a missile toward you at a speed of 0.700c relative to the enemy ship. (See Figure 27.24.) (a) What is the speed of the missile relative to you? Express your answer in terms of the speed of light, (b) If you measure the enemy ship to be 8.00 ×10⁶ km away from you when the missile is fired, how much time, measured in your frame, will it take the missile to reach you?

Figure 27.24

Problem 16.