Answer:
don't post irrelevant questions
Explanation:
It is given that,
Length of the string, l = 2 m
Mass of the string, 
Hanged mass in the string, 
1. The tension in the string is given by :


T = 1.96 N
2. Velocity of the transverse wave in the string is given by :

m = M/l


v = 28 m/s
Hence, this is the required solution.
The change in internal energy of a system is given by (second law of thermodynamics)

where Q is the heat absorbed by the system and W is the work done on the system.
In order to correctly evaluate the internal energy change, we must be careful with the signs of Q and W:
Q positive -> Q absorbed by the system
Q negative -> Q released by the system
W positive -> W done on the system by the surroundings
W negative -> W done by the system on the surroundings
In our problem, the heat released by the system is

(with negative sign since it is released by the system), and the work done is

still with negative sign because it is performed by the system on the surrounding, so the change in internal energy is
An object in motion will remain in motion unless an outside force stops is.