Which phrase describes carbon-14 dating? uses the rate at which nitrogen-14 decays into carbon-14 dates the remains of organisms to determine when they died measures the number of unstable elements in ancient volcanic rocks determines the age of ancient fossils older than 50,000 years old

Carbon-14 dating is described as "a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon".

With that in mind, I think out of the four choices, your best bet is "B. dates the remains of organisms to determine when they died".

The answer is B

Explanation:

(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