Answer:
37.8225 J
Explanation:
kinetic energy = 1/2 of mass x 
Sonar<span> (originally an acronym for Sound Navigation And Ranging) is a technique that uses sound propagation (usually underwater, as in submarine navigation) to navigate, communicate with or detect objects on or under the surface of the water, such as other vessels.</span>
velocity is of sound id defined as distance covered by sound per unit time
here given that
distance covered by sound = 3.5 m
time taken by the sound = 0.919 millisecond
So the velocity of sound will be given as



so the speed of sound in the given medium is 3808.5 m/s
As we know that speed of sound in any substance is given as

As per the data available online the speed of sound in gold is 3250 m/s while speed of sound in glass is 4500 m/s
So here we can say the above speed is in between these two mediums whose elasticity and density ratio is more than gold but less than glass.
So this velocity of sound is nearly match with the data obtained for copper
So this speed is approx obtained in copper
Answer:
Below:
Explanation:
It's the definition of "Cognitive Dissonance".
Question 2 is because the passengers have inertia, which is a tendency to resist change in motion