Which statements about surface gravity are true? Select all that apply.
a. Earth's surface gravity has no effect on the tides.
b. A 180-pound person on Earth weighs 30 pounds on the moon.
c. A space ship has the same mass on Earth as it has on the moon.

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.

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