A wind speed of
25
25 km/h is measured on the deck of the ship. A kite sail can fly at a height of
120
120 m. At that height, the wind speed is approximately
20
%
20% higher than down on the deck of the ship.
After finding the value of
20
%
20% of
25
25, which operation has to be performed to obtain the value of
20
%
20% higher than
25
25?
Answer
Add
5
5 to
25
25
Subtract
5
5 to
25
25
Multiply
5
5 to
25
25
Divide
5
5 to
25
25
To calculate the wind speed at a height of 120 m, we can use the ratio 20% higher to determine the relative increase in wind speed. To find the value of 20%, we can multiply 25 km/h by 0.20, which gives us a value of 5 km/h. In order to find the wind speed at a height of 120 m, we need to add this value of 5 km/h to the initial wind speed of 25 km/h. This gives us a final wind speed of 30 km/h at a height of 120 m. This is due to the fact that wind speeds increase with height due to less obstruction and friction from the ground. You can also think of it as a similar concept to stairs - the higher you go, the faster you need to walk to maintain the same pace. Keep in mind that this is an estimate and may not account for other factors such as air density. However, it provides a useful approximation. Hence, the operation that needs to be performed is the addition of 5 km/h to the initial wind speed of 25 km/h.
