Answer:
90 feet
Explanation:
The farmer wants the second side of the garden to be 30 feet longer than the back of his house.
If the back of his house=x ft
The second side=(x+30) ft
Note that the farmer does not fence the side on the back of the house.
Area of the garden = 400 square feet
Area of a Rectangle= Length X Width
400 = x(x+30)
x+40=0 or x-10=0
x=-40 or x=10
Since length cannot be negative, x=10 ft
The Length of the Fencing the farmer will buy will be the perimeter of the three sides.
Perimeter of the three sides = x+(x+30)+(x+30)
=3x+60
=3(10)+60=90 ft
The farmer needs to buy a fencing of length 90 feet.
The two main things are speed and velocity. you have to factor in a bunch of smaller things too, but those don't really have much of an effect. And mass inertia is the resistance of any physical object to any change in its state of motion. The velocity of an object will determine the inertia that the object has. Good luck on your assignment and have a great day! :D
Answer : The mechanical energy of the rock is, 134 J
Solution :
As we know that the mechanical energy is equal to the sum of the kinetic energy and the potential energy.
The formula used for mechanical energy is,
where,
M.E = mechanical energy
K.E = kinetic energy
P.E = potential energy
m = mass of an object = 2 Kg
v = velocity of an object = 6 m/s
h = height = 5 m
g = acceleration due to gravity = 
Now put all the given values in the above formula, we get the mechanical energy of the rock.
![M.E=[\frac{1}{2}(2Kg)\times (6m/s)^2]+(2Kg\times 9.8m/s^2\times 5m)=134\text{ Kg }m^2s^{-2}=134J](https://tex.z-dn.net/?f=M.E%3D%5B%5Cfrac%7B1%7D%7B2%7D%282Kg%29%5Ctimes%20%286m%2Fs%29%5E2%5D%2B%282Kg%5Ctimes%209.8m%2Fs%5E2%5Ctimes%205m%29%3D134%5Ctext%7B%20Kg%20%7Dm%5E2s%5E%7B-2%7D%3D134J)
Therefore, the mechanical energy of the rock is, 134 J
