A string tied between two post is oscillating at 3Hz. A student determines the standing waves have a length of 4 meters. What is the velocity of the wave?

The velocity of the wave is 12 m/s.

Explanation:

We know the formula for the velocity of wave as:

                                              v = f

where,

v= velocity of wave

f = frequency of  wave

= wavelength of wave

Substituting the values we get;

                                        v = 3 × 4 m/s

                                     ∴ v = 12 m/s

In this way we calculated the velocity of wave as 12 m/s.

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be