8. When an object is 28 cm in front of a concave mirror, the image is 16 cm in front
of the mirror? What is the focal length of
the mirror?
*

FORMULA

p-the distance of the figure(object)from the vertex of the mirror

l-the distance of the figure from the vertex of the mirror

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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.