Colliders are used to accelerate particles to very-high velocities before impacting them with other particles. in one experiment, two protons are initially moving with equal speeds towards each other. they continue to exist after a head-on collision that also produces a neutral pion. after the collision all three particles are at rest. using conservation of energy show that the initial speed of the protons was from the perspective of one proton how fast is the other proton moving prior in a second interaction a positive pion (π+) is created. the pion is initially traveling 0.36c to the collision? at 0.99c with respect to the rest-frame of the collider. in its rest-frame the pion decays after 2.6 x 10-8s . how far does the particle move in it's own rest-frame before decaying? [ how far does it move in the rest-frame of the collider before decaying? [4] 1.67 × 10-27 kg. the rest-mass of a neutral pion the rest-mass of a proton is mp is m 2.4 x 10-28 kg.