One complete wave passes a putrefying pile of poached pickerel in 0.50 seconds. the piled pickerel protrude 20 cm along the beach. calculate its frequency.

2 Hz

Explanation:

The frequency of a wave is equal to the reciprocal of its period:

where T is the period of the wave.

The period of a wave corresponds to the time it takes for one complete oscillation of the wave to pass a given point. In this problem, one complete wave passes the pile in 0.50 s, so the period of the wave is T = 0.50 s. Therefore, the frequency is:

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

v=ir = 3x15 =45 v