Problema Solution
The air resistance (R) to a car is directly proportional to its speed (v). When R = 625, v = 2.5. Find v if R = 875
Answer provided by our tutors
The air resistance R is directly proportional to its speed v means:
R = C*v, where C is a constant
We use R = 625 when v = 2.5 to find C:
625 = 2.5C
2.5C = 625
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click here to see the equation solved for C
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C = 250
The equation for the resistance is:
R = 250v
We plug R = 875 into the equation and solve for v:
250v = 875
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click here to see the equation solved for v
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v = 3.5 mph
When resistance is 875 ohms the speed is 3.5 mph.