The potential energy of the block is A) 490 J
Explanation:
The potential energy of an object is the energy possessed by the object due to its position in the gravitational field.
It is calculated as follows:
![PE=mgh](https://tex.z-dn.net/?f=PE%3Dmgh)
where
m is the mass of the object
g is the acceleration due to gravity
h is the height of the object above the ground
For the block in this problem, we have:
m = 10 kg
![g=9.8 m/s^2](https://tex.z-dn.net/?f=g%3D9.8%20m%2Fs%5E2)
h = 5 m
Therefore, its potential energy is:
![PE=(10)(9.8)(5)=490 J](https://tex.z-dn.net/?f=PE%3D%2810%29%289.8%29%285%29%3D490%20J)
Learn more about potential energy:
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brainly.com/question/10770261
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The box stopped moving because there was a negative acceleration in the x direction caused by friction.
To find the average speed, simply divide the displacement by time: 10 / 2 = 5 m/s
Extensional stress. is your answer.
"F=Vector Sum Of The Two Forces" Is the answer.