From because when held inhands stmah 3.in an experiment to determine the density of Sand using a density bottle, the following m
easurements were recorded: Mass of empty of density bottle=43.2g Mass of density bottle full of water=66.4g Mass of density bottle with some sand =67.5g Mass of density bottle with sand, filled up with water=82.3g Use the above data to determine the: a) mass of the water that filled the bottle 1mks b) Volume of the water that filled the bottle. 2mk c) Volume of the density bottle Imk. d) Mass of sandlmk e) Mass of water that filled the space above the sand lmk • • • f) Volume of the sand 3mk Density of the sand
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Answer:
Speed of ball just before it hit the surface is 31.62 m/s .
Explanation:
Given :
Mass of ball , m = 50 g = 0.05 kg .
Height from which it falls , h = 80 m .
Thermal energy , E = 15 J .
Now , Initial energy of the system is :
Here , initial velocity is zero .
Therefore ,
Now , final energy of the system :
Since , no external force is applied .
Therefore , total energy of the system will be constant .
By conservation of energy :
Therefore , speed of ball just before it hit the surface is 31.62 m/s .
This is third equation of motion. As there is no values given, I assume you just have to keep variable 'a' (representing acceleration) on one side of the equation and all other variables on the other side.
OR
Here, is initial velocity,
is final velocity ,
is initial position,
is final position, and
a is acceleration.