I am taking an educated guess that he has life insurance
Answer: 4.5 V
Explanation:
Given
The voltage of each cell is 1.5 V
If they are connected end to end their potential added to give a higher potential i.e. 1.5+1.5+1.5=4.5 V
Answer:183.94 N
Explanation:
Given
Time Period 
mass of child 
Radius 
Velocity 


Now Centripetal Force will be Balanced by Frictional Force
Centripetal Force 


therefore Friction Force is 183.94 N
The kinetic energy decreases