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melomori [17]
4 years ago
13

Scientists think that our four legged mammals might be the distant ancestors of modern-day whales what evidence seems to support

their idea?
A.)animals with similar embryo development
B.)DNA evidence
C.)migration patterns
D.)a series of closely related fossils
Physics
1 answer:
vovangra [49]4 years ago
6 0
B because whales do not have 4 legs, the fossils of whales don't look like fossils of four legged mammals, and migration patterns just doesn't sound right
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1. Which has more kinetic energy, a 40 kg cheetah running at 25 m/s or a 4,000 kg elephant moving at 2 m/s? How much more energy
s2008m [1.1K]

Answer:

1. The elephant has more kinetic energy at this speed and mass. It has 4,500 J more KE.

2. The elephant would have to go at a speed of 2.5 m/s to reach the same KE as the cheetah.

Explanation:

You would use the formula KE=1/2mv^2.

This formula would be filled in and completed twice, once for the elephant and once for the cheetah.

Cheetah:

KE = 1/2 (40) (25) ^2

KE = 12,500 J

Elephant:

KE = 1/2 (4,000) (2) ^2

KE = 8,000 J

This shows that the cheetah has more KE.

Then you would subtract the elephants amount of J from the cheetahs to find the difference.

Difference = 12,500 J - 8,000 J

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I hoped this helped with the first part :)

For the second part:

To find the speed the elephant would have to run you would fill in and complete the equation once more with different distance results.

KE = 1/2 (4,000) (2.5) ^2

KE= 12,500 J

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