They are magnetic
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Answer:

Explanation:
Let consider a car travelling at a speed  . The ratio of final kinetic energy to initial kinetic energy:
. The ratio of final kinetic energy to initial kinetic energy:


The final speed is:

 
        
                    
             
        
        
        
Answer:
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The frequency of a simple harmonic oscillator such as a spring-mass system is given by

where 
k is the spring constant
m is the mass attached to the spring.
Re-arranging the formula, we get:

and since we know the constant of the spring:

and the frequency of oscillation:
f=1.00 Hz
we can find the value of the mass attached to it:
