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4 years ago

99 POINTS!!! Please help me ASAP!

Mathematics

1 answer:

PilotLPTM [1.2K]4 years ago

4 0

Answer:

F, T, F, T, T, F, F

hope this helps :)

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A steel ball is dropped from a building’s roof and passes a window, taking 0.125 s to fall from the top to the bottom of the win

Anna35 [415]

Answer:

20.425 m

Step-by-step explanation:

t = Time taken

u = Initial velocity

v = Final velocity

s = Displacement

a = Acceleration due to gravity = 9.81 m/s²

$s=ut+\frac{1}{2}at^2\\\Rightarrow u=\frac{s-\frac{1}{2}at^2}{t}\\\Rightarrow u=\frac{1.2-\frac{1}{2}\times 9.81\times 0.125^2}{0.125}\\\Rightarrow u=8.98\ m/s$

Now this will the final velocity when it reaches the top of the window

$v^2-u^2=2as\\\Rightarrow s=\frac{v^2-u^2}{2a}\\\Rightarrow s=\frac{8.98^2-0^2}{2\times 9.81}\\\Rightarrow s=4.11\ m$

$v=u+at\\\Rightarrow v=8.98+9.81\times 0.125\\\Rightarrow v=10.21\ m/s$

If the upward flight is an exact reverse of the downward flight then the time taken while going down will be 1 second and going up will be 1 second.

$s=ut+\frac{1}{2}at^2\\\Rightarrow s=10.21\times 1+\frac{1}{2}\times 9.81\times 1^2\\\Rightarrow s=15.115\ m$

Hence total height of the building is 4.11+1.2+15.115 = 20.425 m

4 0

3 years ago

My answers are c,d am I correct

Lady_Fox [76]

Yes you seem to
be correct

6 0

3 years ago

Find the volume of the triangular pyramid to the nearest whole number. the base is 12 the height is 17. and the apothem is 10 in

soldi70 [24.7K]

So the equation is (base *height)/2
In this case: 12*17= 204
204/2=102 in^3
I hope I lead you to the right path. Im sorry if I am wrong.

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3 years ago

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QveST [7]

Answer:

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Step-by-step explanation:

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3 years ago

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3 years ago