Answer:
Explanation:
Sam mass=75kg
Height is 50m
20° frictionless slope
Horizontal force on Sam is 200N
According to the work energy theorem, the net work done on Sam will be equal to his change in kinetic energy.
Therefore
Wg - Ww =∆K.E
Note initial the body was at rest at top of the slope.
Then, ∆K.E is K.E(final) - K.E(initial)
K.E Is given as ½mv²
Since initial velocity is zero then, K.E(initial ) is zero
Therefore, ∆K.E=½mVf²
Wg is work done by gravity and it is given by using P.E formulas
Wg=mgh
Wg=75×9.8×50
Wg=36750J
Ww is work done by wind and it's is given by using formulae for work
Work=force × distance
Ww=horizontal force × horizontal distance
Using Trig.
TanX=opposite/adjacent
Tan20=h/x
x=h/tan20
x=50/tan20
x=137.37m
Then,
Ww=F×x
Ww=200×137.37
We=27474J
Now applying the formula
Wg - Ww =∆K.E
36750 - 27474 =½×75×Vf²
9276=37.5Vf²
Vf²=9275/37.5
Vf²= 247.36
Vf=√247.36
Vf=15.73m/s
4.plants
Explanation:
One of the main processes that is responsible for the removal of carbon dioxide in the atmosphere is photosynthesis.
- Plants are autotrophs that produce their own food in the ecosystem.
- Other form of life depends on them for nourishment.
- A certain process known as photosynthesis is used by plants to manufacture their own food.
- In this process, green plants use carbon dioxide and water in the presence of sunlight to produce their own food.
- Through this process oxygen is released as a by product.
Learn more ;
Photosynthesis brainly.com/question/4324141
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The frequency of the activity <span />
Answer: 5 words >>>> he is living a life
Explanation:
