3 years ago

Which of these answers best describes a fossil?

Physics

2 answers:

Anettt [7]3 years ago

6 0

Answer:

Explanation:

The definition of a fossil is the preserved remains of a prehistoric organism or is slang for someone or something that is outdated. An example of a fossil is the preserved remains from a prehistoric organism that have been preserved inside rock.

Mekhanik [1.2K]3 years ago

3 0

C is the answer. Remains of a once living organism found in layers of rock, ice, or amber

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Fiesta28 [93]

Answer:

6.0 m/s

Explanation:

According to the law of conservation of energy, the total mechanical energy (potential, PE, + kinetic, KE) of the athlete must be conserved.

Therefore, we can write:

$KE_i+PE_i =KE_f+PE_f$

$\frac{1}{2}mu^2+0=\frac{1}{2}mv^2+mgh$

where:

m is the mass of the athlete

u is the initial speed of the athlete (at the bottom)

0 is the initial potential energy of the athlete (at the bottom)

v = 0.80 m/s is the final speed of the athlete (at the top)

$g=9.8 m/s^2$ is the acceleration due to gravity

h = 1.80 m is the final height of the athlete (at the top)

Solving the equation for u, we find the initial speed at which the athlete must jump:

$u=\sqrt{v^2+2gh}=\sqrt{0.80^2+2(9.8)(1.80)}=6.0 m/s$

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