An ice skater moves down the rink at a constant speed.
A newspaper delivery boy travels at a constant speed while “losing” mass by throwing his newspapers on porches.
A car coasts down a hill at a constant speed.
A child rides a tricycle at a constant speed.
The cannon and the cannonball have the same magnitude of momentum.
The cannon and the cannonball have the same kinetic energy.
The force on the cannon due to the cannonball and the force on the cannonball due to the cannon have the same magnitude.
The impulse on the cannon due to the cannonball and the impulse on the cannonball due to the cannon has the same magnitude.
None of the answers
Remained the same.
Was zero while stationary and increased when the person got off.
Was greatest while the person laid on it.
Was zero when the person got off of the raft and increased while the person was on the raft.
The lighter skater has less momentum.
Their momenta are equal but opposite.
The lighter skater has half of the momentum that the heavier skater has.
Their total momentum increases after the crash.