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3 years ago

hi, I want to ask how do I change the Brainly to another country?, because I pressed the wrong Brainly button to my country

Computers and Technology

2 answers:

Tcecarenko [31]3 years ago

5 0

Answer:

go in brainly app settings than go down u will see that u r connected to brainy . com

then click brainly.com u will get a option that do u want to change u r country then say yes and choose your country .

Setler [38]3 years ago

3 0

Answer:

I don't know maybe you should Uninstall

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3.A ball is thrown into the air with an initial velocity of 15 m/s. a.How long does it take the ball to reach maximum height?b.W

ehidna [41]

Answer: a) = 1.5 sec. b= 11.5 m. c=0 d= 1.5 sec.

Explanation:

a) Once thrown into the air , the only influence on the ball is gravity, so, we can conclude that the acceleration acting on the ball is the one due to gravity, i.e., g= 9.8 m/sec².

Applying the definition of acceleration, we can write the following equation:

a= (vf-vo) / t ⇒ g = vf-vo / t. (1)

Now, when the ball reaches to his maximum height, it stops momentarily, and then starts to fall, so for this height, we can write vf=0.

Replacing in (1), and solving for t, we get:

t = (0 -vo) / g = -15 m/s/ - 9.8 m/sec² (Taking upward as positive direction)

a) t= 1.5 sec.

Replacing this value in the kinematic equation for displacement, when vo=15 m/s, we get:

hmax: 15 m/sec . 1.5 sec -1/2. 9.8 m/sec². (1.5 sec) ² (2)

b) hmax= 11.5 m

c) vf= 0 (as explained above)

Finally, in order to know how long the ball takes to return to its initial height, we know that for the falling part of the trajectory, vo=0, so we can write the equation for displacement as follows:

h=-hmax (because it returns to the same starting point)= 1/2 gt²=-11.5 m

Solving for t, we get:

d) t=1.5 sec.

It can be seen that the time used in going up, it is the same for going down, to travel the same distance.

This result is completely general and applies to any free fall problem.

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hi, I want to ask how do I change the Brainly to another country?, because I pressed the wrong Brainly button to my country​

hi, I want to ask how do I change the Brainly to another country?, because I pressed the wrong Brainly button to my country