A60-kilogram man holding a 20-kilogram box rides on a skateboard at a speed of positive 7 meters per second. he throws the box behind him, giving it a velocity of negative 5 meters per second, with respect to the ground. what is his velocity, in meters per second, after throwing the object?

Which composition of water moves to begin a deepwater current?

Assume that two of the electrons at the negative terminal have attached themselves to a nearby neutral atom. there is now a negative ion with a charge -2e at this terminal. what are the electric potential and electric potential energy of the negative ion relative to the electron? the electric potential and the electric potential energy are both twice as much. the electric potential is twice as much and the electric potential energy is the same. the electric potential is the same and the electric potential energy is twice as much. the electric potential and the electric potential energy are both the same. the electric potential is the same and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron. the electric potential is twice as much and the electric potential energy is increased by the mass ratio of the oxygen ion to the electron.

Which of the following is not an appropriate unit for acceleration? (kg/12 mihr? m/min/sec cm/30c?