Answer:
Cannonball b spends more time in the air than cannonball a.
Explanation:
Starting with the definition of acceleration, we have that:
Since both cannonballs will stop in their maximum height, their final velocity is zero. And since the acceleration in the y-axis is g, we have:
Now, this time interval is from the moment the cannonballs are launched to the moment of their maximum height, exactly the half of their time in the air. So their flying time t_f is (the minus sign is ignored since we are interested in the magnitudes only):
Then, we can see that the time the cannonballs spend in the air is proportional to the vertical component of the initial velocity. And we know that:
Finally, since 
and 
, we can conclude that:
In words, the cannonball b spends more time in the air than cannonball a.
That would be a series circuit
They aren’t. Brightness comes from the frequency of waves to your eye
A person running is an example of something that has kinetic energy
(More in general: any object which is moving is an example of kinetic energy)
Explanation:
Kinetic energy is the energy possessed by a body due to its motion.
Mathematically, the kinetic energy of a body is given by:
where
K is the kinetic energy
m is the mass of the body
v is the speed of the body
As we can see:
- The kinetic energy is proportional to the mass of the body
- The kinetic energy is proportional to the square of the speed of the body
This means that an object has kinetic energy whenever its speed is non-zero: so, every object in motion has kinetic energy.
Therefore, a person which is running is an example of something that has kinetic energy.
Learn more about kinetic energy:
brainly.com/question/6536722
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Answer: because you touch things with your finger and not with your neck and you finger has to be more sensitive to feel the thing you are touching.
Explanation:
