A roller coaster car rapidly picks up speed as it rolls down a slope. As it starts down the slope, its velocity is 4 m/s. But 6 seconds later, at the bottom of the slope, its velocity is 46 m/s. What is its average acceleration Hurry

i think the answer is -7

Explanation:

4 - 46 = -42       -42\6 is -7  i dont know if its right

chert is a sedimentary rock composed of microcrystalline or cryptocrystalline silica. with this little bit of information, you can come to the conclusion that your answer is c.  

explanation:

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate