Question

You watch a distant lady driving nails into her front porch at a regular rate of 1 stroke per second. You hear the sound of the blows exactly synchronized with the blows you see. And then you hear one more blow after you see her stop hammering. How far away is she? The speed of sound is 340 m/s.

Answer 1

Answer:

340 meters

Explanation:

For this we have to use the formula of constant velocity motion:

$d=v*t\\where:\\d=distance\\v=velocity\\t=time$

Because you hear the blows exactly 1 per second. And you hear only one blow after she finished, the sound takes one second to get to you.

$d=340(m/s)*(1(s))=340m$