Speed equals distance divided by time (Speed=Distance/Time).
For example if it takes someone three minutes to go three miles their speed is one mile a minute.
 
        
             
        
        
        
Answer:
49.5 Hz. 
Explanation:
From the question given above, the following data were obtained:
Period (T) = 0.0202 s
Frequency (f) =? 
The frequency and period of a wave are related according to the following equation:
Frequency (f) = 1 / period (T)
f = 1/T
With the above formula, we can obtain the frequency of the wave as follow:
Period (T) = 0.0202 s
Frequency (f) =? 
f = 1/T
f = 1/0.0202
f = 49.5 Hz
Therefore the frequency of the wave is 49.5 Hz. 
 
        
             
        
        
        
Answer:
Wg is positive and WT negative.
(Letters in options are all wrongly written).
Explanation:
Remember that the work of a force is the internal product between the force and the displacement  .
.
Since the displacement is downwards like the weight, the work done by gravity is positive, while the work done by the tension is negative since it points upwards.
 
        
             
        
        
        
You haven't told us what the passing percentage is on the exam, 
or what the passing percentage is for the semester, or any of that.
        
             
        
        
        
I know for sure that the third one is correct