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3 years ago

Whats the difference between relative dating and absolute dating

2 answers:

5 0

Relative Dating- Scientists compare the fossil(s) to its surroundings to get a close answer to the age.
Absolute Dating - Use a specified Chronology in archeology and geology, this helps to decide the exact age of the fossil(s).
Absolute Dating has a greater accuracy than that of Relative Dating.

djyliett [7]3 years ago

3 0

Relative dating and absolute dating are used to determine age of fossils and geologic features, but with different methods. Relative dating uses observation of location within rock layers, while absolute dating uses data from the decay of radioactive substances within an object.

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The speed of the rock at 20 m is 34.3 m/s

Explanation:

We can solve this problem by using the law of conservation of energy: the mechanical energy of the rock, sum of its potential energy + its kinetic energy) must be conserved in absence of air resistance. So we can write:

$U_i +K_i = U_f + K_f$

where :

$U_i$ is the initial potential energy

$K_i$ is the initial kinetic energy

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The equation can also be rewritten as follows:

$mgh_i + \frac{1}{2}mu^2 = mgh_f + \frac{1}{2}mv^2$

where:

m = 100 kg is the mass of the rock

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u = 0 is the initial speed (the rock starts at rest)

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v is the final speed when h = 20 m

And solving for v, we find:

$v=\sqrt{2g(h_i-h_f)}=\sqrt{2(9.8)(80-20)}=34.3 m/s$

Learn more about kinetic energy and potential energy here:

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