Aneutral pion (mass = 135 mev) decays into two back-to-back photons in its rest frame [3 points] what is the energy of each photon in the pion rest frame? a. b. [3 points] if the neutral pion has a momentum of 500 mev before it decays, and the photons from the decay are aligned along the direction of motion (i. e. the decay takes place along the direction of motion), what is the energy of each photon?

Ablock of mass m slides on a horizontal frictionless table with an initial speed v0 . it then compresses a spring of force constant k and is brought to rest. the acceleration of gravity is 9.8 m/s2. how much is the spring compressed x from its natural length? 1) x = v0*sqrt(k/(mg)) 2) x=v0*sqrt(m/k) 3) x=v0*((mk)/g) 4) x=v0*sqrt(k/m) 5) x=v0*(m/kg) 6) x=v0*sqrt((mg)/k) 7) x=(v0)^2/(2g) 8) x=v0*(k/(mg)) 9) x=(v0)^2/(2m) 10) x=v0*((mg)/k)