Question

A stone is dropped from rest down a well and a splash is heard after 3.5 seconds. What was the velocity of the stone as it hit the water? What was the average velocity over the 3.5 seconds? How deep is the well?

Answer 1

Answer:

34.3 m/s

Explanation:

Because,it is saying that it was thrown from a height.So,its initial velocity will be zero

u(initial velocity) = 0

v(final velocity) = ?

t(time) = 3 seconds

g( acceleration due to gravity) = 9.8 m/s

The stone is falling from a height towards Earth,That's why,its acceleration will be g

Using Third law of Motion,

v = u +at

It will convert into :

v = u + gt

v= 0+ 9.8(3.5) = 34.3 m/s