A rock is dropped down a well that is 90.0 m deep. 4.54 s long before you hear the splash (the velocity of sound is 343 m/s).
Here the Rock moves under the influence of Gravity.
Hence the time needed for the Rock to hit the water =( 2* height/g )^0.5
Time = (2*90/9.8 )^ 0.5 = 4.28 s
The splash is heard once the rock hits the water and then the sound is created
Time taken by sound to travel up = 90 m/ 343 m/s = 0.26 s
Hence Total time needed to hear the sound = 4.28+.26 = 4.54 s.
Velocity is the directional velocity of a moving object as an indicator of the rate of change of position observed from a particular frame of reference and measured by a particular time standard.
Velocity is defined as a vector measurement of speed and direction of motion. Simply put, velocity is the speed at which something moves in one direction.
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