Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.

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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snell's law

refractve index = sin incidence / sin refraction

125 m

explanation: