19.) Alan is 12 years old and Emer is 8 years old.
€5400 is divided between them in the ratio of their ages.
How much does each receive?
In eight years time, another €5400 will be divided between them in the ratio of
their ages at that time. How much will they each receive then?

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Ответ:

rebeckas0102

02.12.2020

Mathematics

The two quantites are defined as follows:

$\text{Potential Energy:}\quad E=mgh$

$\text{Kinetic Energy:}\quad E=\dfrac{1}{2}mv^2$

So, a child with mass m=35 kg sits at a height h=3.5 m has potential energy

$E=mgh=35\cdot 9.8\cdot 3.5=1200.5 J$

Similarly, if the same child moves with speed v=5 m/s, he has kinetic energy

$E=\dfrac{1}{2}mv^2=\dfrac{1}{2}\cdot 35\cdot 25=437.5J$

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19.) Alan is 12 years old and Emer is 8 years old.€5400 is divided between them in the ratio of their ages.How much does each receive?In eight years time, another €5400 will be divided between them in the ratio oftheir ages at that time. How much will they each receive then?​