In the future, several students living different types of electromagnetic radiation. Which of the following travels through spac
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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 .