Posted by Deforest on .
A photon of energy E collides with a stationary particle of rest mass m0 and is absorbed by it.
what is the velocity of the resulting composite particle ?
what is the mass of the resulting composite particle?
(use conservation of momentum and energy)

special relativity 
sussex uni amirite?,
answer to part a is v=E/(E+mc^2), not sure about part b.