7. (Y&F, 37.18) An enemy spaceship is moving toward your Starfighter with a speed of 0.400c as measured in your frame. T

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7 Y F 37 18 An Enemy Spaceship Is Moving Toward Your Starfighter With A Speed Of 0 400c As Measured In Your Frame T 1 (18.37 KiB) Viewed 47 times

I understand a & b but am struggling with part c
7. (Y&F, 37.18) An enemy spaceship is moving toward your Starfighter with a speed of 0.400c as measured in your frame. The enemy ship fires a missile towards you at a speed of 0.700c in the reference of the enemy ship. (a) What is the speed of the missile relative to you? Express your answer in terms of c. (b) If you measure that the enemy ship is 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? (c) Calculate relativistic momentum and relativistic kinetic energy of this missile.