Save money on fuel and go for longer
Conservation of momentum requires that the sum of momenta after is equal to that before. Since initially nothing is moving, the sum after the shot will also add to zero.
m₁v₁ = -m₂v₂
Solve for the cannon's velocity v₁
v₁ = -m₂v₂/m₁ = -2.10m/s
The negative sign means it's moving 2.10m/s south.
Volume is length times width times height, so 6 times 9 times 5 is 270 centimeters.
17. a
18. c
19. a
20. c
21. c
