Danielle took an iron nail and wrapped thin copper wire around it, then connected the ends of the copper wire to a battery. Which force or forces can Danielle's device produce?

grav potential energy

the chart show the masses and velocities of two colliding objects that stick together after a collision.

according to the law of conservation of momentum, the momentum of the object after the collision is  

answer

1,500

kg • m/s.

that tool is called an altimeter which measures your altitude which can be used to tell which atmosphere you are currently in, including the stratosphere.

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i don't understand. explain it clearly