AP Physics 1· difficulty 4/5
A 60 kg skater pushes a 30 kg skater away. The 30 kg skater moves at 4 m/s; the 60 kg skater's recoil speed is
m/s
m/s
m/s same direction
m/s in the opposite direction
Explanation
Conservation of momentum from rest: 60·v = 30·4 → v = 2 m/s opposite.
Want 10 more like this — adaptive to your weak spots?
Two skaters at rest, masses 40\text{kg} and 60\text{kg}, push off each other. The 40\text{kg} skater moves at 3\text{m/s}. The 60\text{kg} skater's speed is…
chevron_rightA 200\text{kg} cannon fires a 10\text{kg} ball at 80\text{m/s}. The cannon's recoil speed is…
chevron_rightA 4\text{kg} object at rest explodes into two pieces of equal mass. One moves east at 6\text{m/s}. The other moves…
chevron_right