What force decreases the acceleration of two objects moving against each other?
a. gravity
c. friction
b. air resistance
d. mass

You are given a vector a = 125i and an unknown vector b that is perpendicular to a. the cross-product of these two vectors is a × b = 98k. what is the y-component of vector b?

If a simple machine reduces the strength of a force, what must be increased?

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.