Ep=mgh
h= Ep/mg
h=57÷(3.3×9.8)
h= 57÷32.34
h= 1.8m
So; the answer is B. 1.8m
110 grams
mass of salt + mass of water
10 + 100
110g
Explanation :
To start any lab work initially, we have to know the theory behind the experiment. After then the experiment should be started. At the end, the readings must be taken carefully and some conclusion can be drawn.
Some of the steps are given :
Step 1: Pump up six identical bike tires to the recommended air pressure.
Step 2: Place three tires under heat lamps, and keep the other three tires at room temperature.
Step 3: After four hours, measure the circumference of each tire.
Step 4: Record your results in the table.
The fifth step should be :
Step 5: Write the result or conclusion that shows what you have done during the entire experiment.
Answer:
v = 10 m/s
Explanation:
We have,
Our initial velocity is 20 m/s
Our acceleration, 
It is required to find the velocity after 2 seconds. It is a concept based on equation of kinematics. Using first equation:
Plugging all the known values
So, our final velocity is 10 m/s.
