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4 years ago

Help plz! I'll give brainliest.

Physics

1 answer:

ella [17]4 years ago

5 0

$1) \: accelertion = change \: in \: velocity \div timetaken$
$a = \frac{v - u}{t}$
$2) \: \: u = 45 {ms}^{ - 1} \: \: v = {0ms}^{ - 1} \: t = 10s$
$a = .......$
A=45-0/10
A=4.5 meter per second square

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3 years ago

17. A volleyball weighs about 300 grams.

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Answer:

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Explanation:

Ok, to have the specific data, the first thing we must do is convert from grams to kilograms. Since mass must always be in kilograms (kg)

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We convert it using a rule of 3, replacing, simplifying units and solving:

$\boxed{\bold{x=\frac{gr*1\ kg}{1000\ gr}=\frac{300\ gr*1\ kg}{1000\ gr}=\frac{300\ kg}{1000}=\boxed{\bold{0.3\ kg}}}}$

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Earth's gravity is known to be 9.8 m/s², so we have:

Data:

m = 0.3 kg
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Use formula of potencial energy:

$\boxed{\bold{PE=m*g*h}}$

Replace and solve:

$\boxed{\bold{PE=0.3\ kg*9.8\frac{m}{s^{2}}*15\ m}}$

$\boxed{\boxed{\bold{PE=44.1\ J}}}$

Since the decimal number, that is, the number after the comma is less than 5, it cannot be rounded, then we have this result.

The potential energy of the volleyball is <u>44.1 Joules.</u>

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