John7Gilbert
07.12.2019 •
Mathematics
Aswimmer travels from the south end to the north end of a 30.0 m pool in 15.0 s and makes the return trip to the starting position in 19.0 s. what is the average velocity for the roundtrip?
a.
2.50 m/s to the south
c.
2.50 m/s to the north
b.
2.27 m/s to the north
d.
0.0 m/s
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Ответ:
Because the average velocity takes into account the net displacement which is zero when you finish at the same point that you started.
Ответ:
B.
-8x^7+4x^3+4x+5
There's no way to get rid of or make smaller the 4x^3 and the -8x^7, since there are no other like exponents in the polynomial. B is the only one with a -8x^7