Answer:
cgyd6rvnfu ygoigvigceu fee duucdubr5vef8cuecyec
Hi there!
Recall the equation for kinetic energy:

KE = Kinetic energy (J)
m = mass (kg)
v = velocity (m/s)
Plug in the given values:

Answer:
36 N
Explanation:
Velocity of a standing wave in a stretched string is:
v = √(T/ρ),
where T is the tension and ρ is the mass per unit length.
300 m/s = √(T / 4×10⁻⁴ kg/m)
T = 36 N