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miss Akunina [59]
3 years ago
10

Which equation states Newton's second law?

Physics
1 answer:
Travka [436]3 years ago
8 0
I choose answer B (F=ma)
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if an object is thrown directly upwards remains in the air for 5.6s before it returns to its original position, how long did it
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iragen [17]

(a) -1.5\cdot 10^6 N

First of all, we need to calculate the acceleration of the person, by using the following SUVAT equation:

v^2 -u ^2 = 2ad

where

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u = 20.0 m/s is the initial velocity

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Solving for a,

a=\frac{v^2-u^2}{2d}=\frac{0-20.0^2}{2(0.01)}=-20000 m/s^2

And the average force on the person is given by

F=ma

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b) -1.0\cdot 10^5 N

In this case,

v = 0 is the final velocity

u = 20.0 m/s is the initial velocity

a is the acceleration

d  = 15.00 cm = 0.15 m is the displacement of the person with the air bag

So the acceleration is

a=\frac{v^2-u^2}{2d}=\frac{0-20.0^2}{2(0.15)}=-1333 m/s^2

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F=ma=(75)(-1333)=-1.0\cdot 10^5 N

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