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:

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

h = 5 m
Therefore, its potential energy is:

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If the radius is 7.5 meters, then the circumference would be 47.1239. That times five is 235.6195
Answer:
The force of the nail pushing in the opposite direction
Answer:

Explanation:
As we know by radioactivity law

so here we will have


now we will have


now we also know that


