Answer:
Tha valency of Oxygen is 2 because it need two atom of hydrogen to form water.
False the North Star never changes it position
The boy's momentum is 160 kg*m/s north.
The formula of momentum is p = mv, where p is momentum.
p = 40 kg * 4m/s north
p =160 kg*m/s north<span>Thank you for posting your question. I hope you found what you were after. Please feel free to ask me more.</span>
Gravity is all ways pulling down and the normal force acting on top of the object and for it to have to push or pull to the object
