Answer:
Explanation:
Given
average speed of Phelps 
total distance 
he swims first 100 m at an average speed if 
so time taken is 
suppose
is the time taken to swim remaining half
average velocity is 



so velocity in the second half is

Answer:
71nC is the total charge of the rod
Explanation:
See attached file
Answer:i=300 mA
Explanation:
Given
inductance(L)=40 mH
Resistor(R)=
Voltage(V)=15 V
Time constant(
)=

current 

Current as a function of time is given by

i= 299.95 mA