Why does suction hook stick to the surface of wall and does not drop off

When you press a suction cup against a wall or window, you push out the air inside it, eliminating the pressure inside the suction cup and creating a vacuum which seals the cup tightly to the surface you want it to stick to. ... Friction keeps the cup from sliding.

Explanation:

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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