A large truck moves with a large momentum while driving on the freeway. The truck stops and picks up a load of cargo doubling the mass of the truck. The momentum of the truck is now . a. Zero b. Twice as much c. Four times as much d. Unchanged

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