The diver's speed is 1.4m/s.
Steps
1. Find time.
The equation for time based upon
distance is 2y/9.8m/s cubed. From this
we got 2.1 seconds.
2. Find speed or velocity.
The equation for velocity is d/t=v. From
this we got 1.4m/s.
Unbalanced force.
The definition of an unbalanced force is a force that changes the position, speed or direction of the object to which it is applied.
When an object is still it means that is is balanced force. So you would need to add more force to another side to make it move. Which is unbalanced force.
Answer:

Explanation:
As we know that the frequency of the wave is given as

here we know that

also we know that

now we have

