Hanna, at Rest in Her Spaceship Which Is Moving Past

Multiple Choice

Hanna, at rest in her spaceship which is moving past Earth at 0.800 c, observes a neutron at rest relative to her spaceship decay into a proton, an electron and a neutrino. She notes that the total momentum, , of the decay products is zero after the decay. According to an observer on Earth, the magnitude of the total momentum of the decay products, , is

A) 0.
B) 0.600m_n(0.800c)
C) 0.800m_n(0.800c) .
D) 1.00m_n(0.800c) .
E) 1.67m_n(0.800c) .