Alight-year is a measure of distance (not time). how many meters does light travel in a year? one year is 3.156×107s. g

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

What does si stand for,when referring to a system of measurement

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.