An inverted image is magnified by 2 when object is placed 22 cm in front of a concave mirror. Determine the image distance and focal length of the mirror.

Can someone explain to me how to do this problem ?

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?