Tom's 100kg bumper car is traveling east at 10 m/s when it collides head-on with Ray's 80kg bumper car traveling west. After the collision, Tom's car travels west at 20m/s while Ray's travels east at 15m/s. Determine Ray's initial velocity

Which pair below describes isotopes of the same element? a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons