K= 1/2mv^2
K=1/2(210kg)(10.5 m/s)^2


unit:

Explanation:

The expression given in the question which is

Is the expression for the kinetic energy stored in a system and it is measured in Joules

From the expression we can see that

mass m=210 kg

velocity v= 10.5 m/s

Substituting as seen in the question we have the kinetic energy as

hence the energy stored is 11577.25 Joules

low freq = 100 mhz

low wavelength =101.7m

length = 3x10^8/freq

sonar - device which is used to find the submit submarines, sankalp ship. sonar waves consists of a transmitter and detector which are installed in the observation centre on board of a ship. the ultrasonic waves are sent into the sea at high frequency about 1000 khz in all direction.