When all parts of a circuit ... all the way from one terminal of the
battery or power supply to the other terminal ... are composed of
conducting materials, then current can flow in the circuit, and the
circuit is said to be 'closed'.
Answer:
A) The ball will roll forever in a straight path.
Answer:
The time interval is 
Explanation:
From the question we are told that
The length of the string is 
The mass of the string is 
The tension on the string is 
The velocity of the pulse is mathematically represented as

Where
is the linear density which is mathematically evaluated as

substituting values


Thus


The time taken is evaluated as

substituting values


D
Using the kinetic energy 1/2mv^2 formula
5*10^5 is the answer