At what speed relative to the lab will a 0.272-kg object have the same momentum as a 1.30-kg object that is moving at 0.515c relative to the lab?

Question Consider the inelastic collision. Two lumps of matter are moving directly toward each other. Each lump has a mass of 0.500 kg and is moving at a speed of 0.930c. The two lumps collide and stick together. Answer the questions, keeping in mind that relativistic effects cannot be neglected in this case. What is the final speed vf of the combined lump, expressed as a fraction of c? Uf = What is the final mass mf of the combined lump immediately after the collision, assuming that there has not yet been significant energy loss due to radiation or fragmentation? mf = kg

How much work must be done on an electron to accelerate it from rest to a speed of 0.892c? Number i 3.24e-14 Units J

12. (a) A particle is traveling through the Earth's atmosphere at a speed of 0.750c. To an earth bound observer, the distance it travels is 2.5km. How far does the particle travel in the particle's frame of reference? (b) Calculate the momentum of an electron traveling at a speed 0.985c? The rest mass of the electron is 9.11 X 10-31 kg.