B. One solution (I think)
X+(x-5) +(x-10) ...
This adds up to 8x -140 seconds where x is the 1st race time.
This adds up to 44:20 minutes
44mins * 60 sec/min = 2640 seconds + 20 = 2660 seconds cummulative
8x - 140 = 2660 8x =2800 sec
8x = 350 seconds or 4.5mins for the 1st race
Race 2: subtract 5 seconds yields 4 mins 25 seconds
Answer:
b
Step-by-step explanation:
The height of the water tower is found to be 54.66 meters.
<h3>What is acceleration due to gravity?</h3>
A free-falling object is one that is falling solely due to gravity.
Some key features regarding the acceleration due to gravity are-
- A free-falling component has a downward acceleration of 9.8 m/s/s (on Earth).
- This magnitude for the acceleration of a free-falling object is so significant that it has its own name.
- The acceleration of gravity is the acceleration of any object moving solely under the influence of gravity.
- In fact, the acceleration of gravity is so important quantity that scientists have a special symbol to represent it - the symbol g.
- The most precise numerical value for gravity's acceleration is 9.8 m/s/s.
Now, according to the question;
It takes a watermelon 3.34 sec to reach the ground.
Use the equation of motion in straight line.
D = (1/2) x (gravity) x (time)²
D is the height of the water tower.
= (1/2) x (9.8 m/s²) x (3.34 sec)²
= (4.9 m/s²) x (11.16 sec²)
D = 54.66 meters.
Thus, the height of the water tower is estimated as 54.66 meters.
To know more about acceleration due to gravity, here
brainly.com/question/88039
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