Question

answer correctly please
and fast​

Answer 1

2)density =mass / volume

mass=63kg=6300g

9=6300/v

v=6300/9

v=700cm^3

hope it helps you mate

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Answer 2

Answer:

$\mathcal{\huge{\blue{\underline{\underline{AnswEr}}}}}$

★Density = Mass/Volume

Mass = Density x Volume

Mass = 3000 Kg/m3×5m3 = 15000 Kgs.

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Given :-

Mass = 63 gm

Density = 9 gm/cm³

To Find :-

Volume

SoluTion :-

As we know,

$\sf {\rho = \frac{m}{v} }$

So,

$\sf {v=\frac{m}{\rho} }\\\\\\\sf {v=\frac{63}{9} }\\\\\\\sf {v=7\ cm^{3}}$

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★use formula as same as first one

___________________________

Length of cuboid = 500 cm = 5 m

Width of cuboid = 200 cm = 2 m

Height of cuboid = 1.6 m

Volume of cuboid = 5 * 2 * 1.6

= 16 m^3

____________________________

Average=sum of observations ÷ number of observations.

So,A =(50+40+30)÷3

=120÷3

=40

So, the average speed of the boy is 40m per 10 seconds