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Answer :
Gravitational mechanical energy is given by the expression,
\( W = mgh \)
Where,
h = Vertical displacement = 5 m, m = Mass of the item = 40 kg
g = Acceleration because of gravity = 9.8 m s-2
\( \therefore W = 40 × 5 × 9.8 = 1960 \ J \) .
At half-way down, the mechanical energy of the item are going to be \( \frac{1960}{2} \)
At this time, the item has an equal quantity of potential and K.E.
This can be due to law of conservation of energy. Hence, half-way down, the K.E. of the item can be 980 J.