When you power an electromagnet with 3 batteries, what variable decreases as a result of removing one of those batteries.

The strength of the magnetic field decreases as a result of removing one of those batteries.

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trig 15.3 cos

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.