Landfills generate methane gas through the anaerobic decomposition of organic material in garbage. The gas produced by landfills is a mixture of

methane and carbon dioxide. Because methane is a strong greenhouse gas, landfill gas is often burned in a flare as it is vented from the landfill to

prevent it from entering the atmosphere. Imagine three alternative uses for the gas produced by landfills.

the correct answer is answer a. a mixture

no other options make sense

hope this

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  - sprinkles

a:

by the combination of an unlimited number of elements

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied