A piece of substance of specific head capacity 450JKg^-1K^-1 falls through a vertical distance of 20m from rest. Calculate the rise in temperature of the substance on hitting the ground when all its energies are converted into heat. [g = 10ms^-2]

• A.2/9°C
• B.4/9°C
• C.9/4°C
• D.9/2°C
• E.