BdPho regional Mymensingh Higher Secondary 2019/4
Posted: Sun Feb 17, 2019 8:17 pm
Lily is in a spaceship moving at speed $V=0.5c$ with respct to a viewer at rest on earth. Her friends james and severus are also in their own spaceships.Lily is watching that Severus is going forward at a speed $V_1=0.8c$ and James is going backward at a speed $V_2=0.85c$.
How fast is James going according to Severus?
How fast is James going according to Severus?