An object is moving east, and its velocity changes from 65 m/s to 25 m/s in 10 seconds. Which describes the
acceleration?
O negative acceleration of 4 m/s2
O positive acceleration of 4 m/s2
O positive acceleration of 9 m/s2
O negative acceleration of 9 m/s2

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air

The three classes of rocks are sedimentary, metamorphic, and igneous. how are rocks classified into one of these three groups?

Suppose that the half-life of an element is 1000 years. how many half-lives will it take before one-eighth of the original sample remains? 8 125 12.5 3