Q1. The figure below shows a slide in a children's playground
Metal ladder
Metal support
(a)
A child of mass 18 kilograms goes down the slide
The vertical distance from the top to the bottom of the slide is 2.5 metres.
Calculate the decrease in gravitational potential energy of the child sliding from the
top to the bottom of the slide.
Gravitational field strength = 10 N/kg
Decrease in gravitational potential energy
(2)

P = 450 J

Explanation:

Given that,

Mass of a child, m = 18 kg

The vertical distance from the top to the bottom of the slide is 2.5 metres.

The Gravitational field strength = 10 N/kg

We need to find the decrease in gravitational potential energy of the child sliding from the  top to the bottom of the slide.

The formula for the gravitational potential energy is given by :

P = mgh

Substituting all the values,

P = 18 kg × 10 m/s² × 2.5 m

P = 450 J

Hence, the decrease in gravitational potential energy is 450 J.

it is b. absorbs thermal energy