Answer:
-3
Step-by-step explanation:
This is just another word for slope
y-y over x-x
y: 4-1 =3
x: -2 - (-1)= -1
so 3/-1 which reduces to -3
When the velocity goes from 40km/h to 20 km/h, the kinetic energy decreases by a factor of 4.
<h3>
What happens to the kinetic energy?</h3>
We know that the kinetic energy depends of the square of the velocity. Thus, if we decrease the velocity from 40km/h to 20km/h, then the kinetic energy decreases.
Remember that the kinetic energy is:
K = (m/2)*v²
Where m is the mass.
The initial kinetic energy is:
K = (m/2)*(40km/h)²
The final kinetic energy is:
K' = (m/2)*(20km/h)²
The quotient gives:
K/K' = [ (m/2)*(40km/h)²]/[ (m/2)*(20km/h)²]
K/K' = (40km/h)²/(20km/h)² = 4
So the kinetic energy decreases by a factor of 4.
Learn more about kinetic energy:
brainly.com/question/25959744
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Answer:
shorter piece = 7 ft
longer piece = 19 ft
Step-by-step explanation:
L = longer board
S = shorter board
L+S = 26 then L =26-S
L = 5+2S
substitute for L
26-S = 5+2S
add S to each side & subtract 5 from each side
3S = 21
divide both sides by 3
3S/3 = 21/3
S = 7
L = 19
B is correct
12/3=4
-> 3 x 4 = 12
Answer:
83 percent
Step-by-step explanation: