Projectile proton with a speed of 1000 m/s collides elastically with a target proton initially at rest. the two protons then move along perpendicular paths, with the projectile path at 38° from the o

Projectile proton with a speed of 1000 m/s collides elastically with a target proton initially at rest. the two protons then move along perpendicular paths, with the projectile path at 38° from the original direction. after the collision, what are the speeds of (a) the target proton and (b) the projectile proton?