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BECE Science 2025 Paper

Question : 8

Total: 40

g = 10 m s^{-2}

]

Solution:

Concept:

The kinetic energy just before hitting the ground equals the potential energy at the top of the tree.

Explanation:

Potential energy at the top is given by:

E_p = mgh

Substitute

m = 2\, \mathrm{kg}

g = 10\, \mathrm{m\,s^{-2}}

, and

h = 15\, \mathrm{m}

E_p = 2 \times 10 \times 15 = 300\, \mathrm{J}

By energy conservation, this becomes kinetic energy just before hitting the ground.

Answer:

The kinetic energy is

300.0\, \mathrm{J}

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