 #1
greg_rack
Gold Member
 363
 79
 Homework Statement:

The resistance to the motion of a car is directly proportional to the square of the speed of the car.
The car increases its speed by 20%.
What is the percentage increase in the resistance to the motion of the car?
 Relevant Equations:
 Percentage increase;
So, I simply used the percentage increase formula for the resistance force, but what I come up with is a 9.5% increase, as opposed to the 44% it should be...
Here's my procedure:
Here's my procedure: