Apply the product rule to .

Apply the product rule to .

Apply the product rule to .

Apply the product rule to .

Apply the product rule to .

Raise to the power of .

Rewrite as .

Multiply by .

Multiply by .

Combine and .

Multiply by .

Combine and .

Combine and .

Combine and .

Combine and .

Move to the left of .

Move the negative in front of the fraction.

Factor out of .

Factor out of .

Separate fractions.

Divide by .

Divide by .

Multiply by .

Solve for v v=4/3*((3.14)(18units)^2)