A rock is kicked off of a 50.0 m cliff with an initial velocity of 18.0 m/s in the positive x direction. How far from the base of the cliff will the rock be when it hits the ground?

The focal length of a relaxed human eye is approximately 1.7 cm. when we focus our eyes on a close up object, we can change the refractive power of the eye by about 16 diopters. (a) does the refractive power of our eyes increase or decrease by 16 diopters when we focus closely? explain. (b) calculate the focal length of the eye when we focus closely.