Question

A 30 kg child climbs 15 meters up a tree. When he looks around, when is the child’s potential energy ?

Answer 1

Answer:

Gravitational potential energy of the child = 4410 J.

Explanation:

Given data:

Mass of the child, $m = 30 \ kg$

Mass of the child, $h = 15 \ m$

The gravitational potential energy of the child at 15 m height can be given as,

$GPE = mgh$

$GPE = 30 \times 9.80 \times 15$

$GPE = 4410 \ \rm J.$

Answer 2

The potential energy of the child is 4410J

POTENTIAL ENERGY:

• The potential energy (P.E) of a body refers to its energy at a position. The potential energy can be calculated using the formula below:

P.E = mass (m) × gravitational force of the Earth (g) × height (h)

Where; g = 9.8m/s²

• According to this question, a 30 kg child climbs 15 meters up a tree, his potential energy can be calculated thus:

P.E = 30kg × 15m × 9.8m/s²

P.E = 4410Joules.

• Therefore, the potential energy of the child is 4410J.

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