A figure skater whose mass is 75 kg moves at 6.2 m/s towards his 50-kg-mass partner. The skater’s partner is moving at 5.5 m/s, in the same direction as the skater. When the skater catches up with his partner, he picks her up, without exerting any horizontal forces on his skates. What speed does the skater move at while he is lifting his partner?
A child of mass 32 kg is coasting at 2.4 m/s over flat ground in a wagon of mass 7.6 kg. The child drops a ball of mass 0.83 kg out of the back of the wagon. What is the speed of the wagon after the ball is dropped?
An elephant of mass kg is chasing a hunter of mass 76.5 kg. The elephant is moving at a speed of 6.33 m/s while the hunter is moving at a speed of 8.12 m/s. Both the elephant and the hunter are moving in the same direction, which corresponds to positive displacement.
What is the momentum of the elephant?
What is the momentum of the hunter?
The hunter stops moving and fires a tranquilizer dart of mass 275 g at the elephant. The dart moves at 650 m/s. What is the dart’s momentum?