<em>Kinetic Energy</em> 
=><em><u>It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity.</u></em> 
<em>Potential</em><em> </em><em>Energy</em><em> </em>
<u><em>=</em><em>></em><em>potential energy is the energy held by </em></u><em><u>an</u></em>
<em><u> object because of its position relative to </u></em><em><u>other</u></em>
<em><u> objects, stresses within itself, its </u></em><em><u>electric</u></em>
<em><u> charge, or other factors.</u></em>
<h2>Difference:</h2>
=>Potential energy is a <u>stored</u> energy on the other hand kinetic energy is the energy of an object or a system's particle in <em><u>Motion</u></em>.
 
        
             
        
        
        
Answer:
a. v₁ = 16.2 m/s
b. μ = 0.251 
Explanation:
Given: 
θ = 15 ° , r = 100 m , v₂ = 15.0 km / h 
a. 
To determine v₁ to take a 100 m radius curve banked at 15 ° 
tan θ  = v₁² / r * g 
v₁ = √ r * g * tan θ 
v₁ = √ 100 m * 9.8 m/s² * tan 15° = 16.2 m/s
b.
To determine μ friction needed for a frightened 
v₂ = 15.0 km / h * 1000 m / 1 km * 1h / 60 minute * 1 minute / 60 seg 
v₂ = 4.2 m/s
fk = μ * m * g 
a₁ = v₁² / r = 16.2 ² / 100 m = 2.63 m/s²
a₂ = v₂² / r = 4.2 ² / 100 m = 0.18 m/s²
F₁ = m * a₁  ,  F₂ = m * a₂ 
fk = F₁ - F₂   ⇒  μ * m * g = m * ( a₁ - a₂) 
μ * g = a₁ - a₂   ⇒  μ = a₁ - a₂ / g 
μ = [ 2.63 m/s² - 0.18 m/s² ] / (9.8 m/s²) 
μ = 0.251 
 
        
             
        
        
        
The maximum speed of the donkey is 10.72m/s
The question is based on the principle of motion in one dimension and hence formulas of motion in one dimension can be applied.
It is given that donkey attains an acceleration of 1.6 m/s^2
The time taken to accelerate  to given speed is 6.7 seconds
We use the formula v=u + at to find the fastest speed
v is the final or maximum speed
u is the initial speed which in this case is 0 as the donkey is at rest
a is the acceleration of the donkey
t is  the time taken in seconds
v = u + at
v= 0 + 1.6 x 6.7
  = 10.72 m/s
Hence the donkey obtains the speed of 10.72 m/s 
For further reference:
brainly.com/question/24478168?referrer=searchResults
#SPJ9
 
        
             
        
        
        
If the scale reads 650N, then the mass of whoever it is standing on the scale is
         (weight) / (gravity)  =  (650N) / (9.8 m/s²)  =  66.3 kilograms  .
It's not MY mass, even if I'm the one standing on the scale.  
If I stand on a scale and it reads 650 N, the scale is broken.
        
             
        
        
        
The average speed of the football is 15 meters per second. Just divide both of the numbers by 4 :)