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2 years ago

NO LINKS OR ANSWERING QUESTIONS YOU DON'T KNOW!!!

Mathematics

2 answers:

scZoUnD [109]2 years ago

4 0

Answer:

"A" would be positive 2/ no, it is not because the opposite of 2 is -2

Step-by-step explanation:

negative and a negative is a positive

eduard2 years ago

3 0

9514 1404 393

Answer:

see attached

Step-by-step explanation:

a) The opposite of the opposite of 2 is 2. It is located 2 units to the right of 0 on the number line. In the attached, it is the red dot labeled P.

b) The opposite of 2 is -2. It is located 2 units to the left of 0 on the number line. In the attached, it is the blue dot. It is not in the same place as point P.

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A cannonball of mass 1kg is shot vertically upward from the top of a building with an unknown velocity v_0(m/sec).v 0 (m/sec).

Bumek [7]

Taking the upward direction to be positive, the cannonball's height $y(t)$ in the air at time $t$ is given by

$y(t)=y_0+v_0 t-\dfrac g2t^2$

where $g$ is the magnitude of the acceleration due to gravity, 10 m/s^2, and $y_0$ is the height of the building from which the ball is being thrown.

At the moment the cannonball reaches its maximum height of 30 m, its velocity at that time is 0, so that

$0^2-{v_0}^2=-2g(30\,\mathrm m-y_0)\implies v_0=\sqrt{\left(20\dfrac{\rm m}{\mathrm s^2}\right)(30\,\mathrm m-y_0)}$

Substitute this into the height equation above, and let $t=2\,\mathrm s$ , for which we have $y(2\,\mathrm s)=30\,\mathrm m$ :

$30\,\mathrm m=y_0+\sqrt{\left(20\dfrac{\rm m}{\mathrm s^2}\right)(30\,\mathrm m-y_0)}(2\,\mathrm s)-\left(5\dfrac{\rm m}{\mathrm s^2}\right)(2\,\mathrm s)^2$