Which equation is most likely used to determine the acceleration from a velocity vs. time graph?

In positive numbers less than 1, the zeros between the decimal point and non zero are significant

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.

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.