nicoleyakuta
01.12.2020 •
Physics
A car has stable speed u0 = 20 m / s and begins to decelerate at a constant rate
4 m / s2. Its displacement during the 2nd second of its movement is:
a) 26 m b) 14 m c) 6 m
Choose the correct answer and justify it.
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Ответ:
It must have the same slope as the given line, so
m = -A/B = -1/-2 = 1/2
So far, we have
y = mx + b = x/2 + b
Use the given point to find b.
4 = -2/2 + b = -1 + b
b = 5
y = x/2 + 5
Multiply through by 2.
2y = x + 10
Standard form:
x - 2y = -10