need help with this question on excel

Suppose an anemometer is set up at a height of 2 m above the ground in a corn field. Use equation (3.27) to calculate the velocity profiles up to a height of 5 m above the ground when the anemometer measures a velocity of 4 m/s and

a. the corn is at a height of 0.5 m;

b. the corn is at a height of 1.5 m. Plot both profiles on the same graph (arithmetic axes), with z on the vertical axis (m) and u(z) on the horizontal axis (m/s).