An athlete runs 1600 meters down a straight road. over the first 800.0 meters, his average velocity is 4.30 m/sec. what is te runners average velocity over the entire race?

The substances that are necessary for producing of certain hormones and that store and transport vitamins

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c