What is the velocity of an object that is falling to Earth for 8 seconds? 1.225 m/s b. 9.8 m/s2 c. 78.4 m/s d. 0.816 m/s2

Explanation:

Just use the acceleration equation here:

where a = -9.8; velocity is also negative because it's falling down and down is negative. Filling in:

so

-9.8(8) = -v and

v = 78.4 m/s downward (the word "downward" takes place of the negative sign)

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

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