Fill in the blanks: 1. When a spring is pulled, the is proportional to the ( called law.
2.Weight is the force of on an object due to the pull of the
3. Weights and other forces are measured in
4. Here on Earth, the pull of gravity on a mass of 1 kg is Newtons
5. Weight is measured by a balance and from place to place
6. Newton's first law says: every mass stays at or moves at constant in a line unless a resultant acts on it
7. To move in a orbit, an object must have a force on it

i believe it is b. what was the cause of the big bang

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

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.