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Identify the relevant variables

v_0 = 20 \text{ m/s}, v_{final} = 0 \text{ m/s}, g = 9.8 \text{ m/s}^2

Use the kinematic equation

v_{final}^2 = v_0^2 - 2gh

Solve for height h

0 = (20)^2 - 2 \cdot 9.8 \cdot h
2 \cdot 9.8 \cdot h = 400
h = \frac{400}{19.6} = 20.41 \text{ meters}

Identify that HCl is a strong acid

HCl \rightarrow H^+ + Cl^-

For strong acids, [H+] equals the molarity of the acid

[H^+] = 0.025 \text{ M}

Calculate pH using the formula

pH = -\log_{10}[H^+]
pH = -\log_{10}(0.025)
pH = 1.60

Identify the variables

FC = \$1000, VC = \$5 per unit, P = \$15 per unit

Use the break-even formula

TR = TC
P \times Q = FC + VC \times Q

Solve for quantity Q

15Q = 1000 + 5Q
15Q - 5Q = 1000
10Q = 1000
Q = 100 \text{ units}