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1 year ago

Hello!!! Can u help me with this: 2 - (-8) = ?

Mathematics

1 answer:

alekssr [168]1 year ago

4 0

We are given the following problem

$2-(-8)$

As you can see, the negative sign is being multiplied with a negative sign.

Recall that when a negative sign is multiplied with a negative sign then the result is a positive sign.

$2-(-8)=2+8=10$

Therefore, the result is positive 10

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2 years ago

If the acceleration of an object is given by dv/dt = −2v, Find the position function s(t) if v(0) = 7 and s(0) = 0.

kirill [66]

Answer:

Step-by-step explanation:

Given that acceleration of an object is

$\frac{dv}{dt} =-2v\\\frac{dv}{v} =-2dt\\ln v = -2t+C\\$

is the solution to the differential equation

Since v(0) =7

we get ln 7 = C

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3 years ago

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Nat2105 [25]

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2 years ago

Where v is the final velocity (in m/s), u is the initial velocity (in m/s), a is the acceleration (in m/s²) and s is the distanc

Anna11 [10]

Answer:

The final velocity v is 21.74 m/s.

Step-by-step explanation:

Given:

$\textrm{initial velocity} = u = 9\ m/s\\\textrm{acceleration} = a = 7\ m/s^{2}\\\textrm{distance} = s = 28\ m$

To find:

$\textrm{final velocity} = v = ?$

Solution:

As we know the third equation of motion is represented as

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Substituting the values u, a and s in the above equation we get

$v^{2} = 9^{2} + 2\times 7\times 28\\ =81 + 392\\=473\\$

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Anna007 [38]

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