Answer:
It is impossible to create a perpetual motion machine because some of the energy will always be lost in the conversion  and therefore it will eventually stop.
Correct Answer : Option B
Explanation:
The perpetual motion machine is impossible machine as it is hypothetical working machine which would be in motion for an indefinite time in continuity of the motion. The continuity of motion for an indefinite time would mean that the working principle of the machine would never allow the dissipation of energy from the machine and all the machine would ultimately reserve all the energy and be converting it into forms without any loss.
This working principle is violation of first and second laws of thermodynamics and hence a machine will eventually lose some of its energy in every conversion of the working cycle and hence there will be a time where the machine would be stopped, and hence a perpetual motion machine cannot be made.
 
        
             
        
        
        
Answer:
 ( 80.87 i - 12.96 j ) m 
Explanation:
Running back movements : 
20⁰ north of east  for  10 meters,  
Runs straight east for 60 meters
runs 35⁰ east of south for 20 meters
A) show vector pointing from the starting point to the end ( where he scored )
The final vector displacement : ( 80.87 i - 12.96 j ) m 
which is : 81.90 m, 9.10⁰ south of east 
attached below is the required  diagram
 
        
             
        
        
        
The change in momentum is 5500 kg m/s
Explanation:
The change in momentum of an object is given by

where
m is the mass of the object
v is the final velocity
u is the initial velocity
In this problem, we have:
 (mass of the motorcycle)
 (mass of the motorcycle)
 (final velocity)
 (final velocity)
 (initial velocity)
 (initial velocity)
Therefore, the change in momentum is

Learn more about change in momentum:
brainly.com/question/9484203
#LearnwithBrainly
 
        
             
        
        
        
26.2/3.4 would be the average velocity for the run.
7.7 miles/hr