Answer:
Part 1) Time of travel equals 61 seconds
Part 2) Maximum speed equals 39.66 m/s.
Explanation:
The final speed of the train when it completes half of it's journey is given by third equation of kinematics as
where
'v' is the final speed
'u' is initial speed
'a' is acceleration of the body
's' is the distance covered
Applying the given values we get
Now the time taken to attain the above velocity can be calculated by the first equation of kinematics as
Since the deceleration is same as acceleration hence the time to stop in the same distance shall be equal to the time taken to accelerate the first half of distance
Thus total time of journey equals
Part b)
the maximum speed is reached at the point when the train ends it's acceleration thus the maximum speed reached by the train equals 
The acceleration of the bike is equal to 
opposing the movement (to the right).
Why?
Since after the rider slams the brakes, the bike came to a stop, we know that the acceleration is opposite to the velocity/movement.
We can use the following equation to calculate the acceleration:
So, substituting, we have: (let's consider negative to the left and positive to the right)
The negative sign means that the acceleration's direction is opposite to the movement.
Hence, we have that the acceleration is equal to opposing the movement (to the right).
Have a nice day!
The trachea allows for the passage of air, and the esophagus allows for the passage of food
Answer: Option D.
<u>Explanation:</u>
The trachea and the esophagus are not the same. The former is related with the respiratory system which is related with breathing while the latter is related with the digestive system.
The trachea connects the upper airways to the lungs for the passing of the air but the esophagus is related with the passage of the food connecting the mouth with the stomach.
Geography. Are there any A, B, C, or D options?
