Question

To see how deep a well is you drop a rock in. The rock hits the water 10 seconds later.
How deep is the well? Draw the velocity-time graph for this motion.

Answer 1

Answer:

490m

Explanation:

Given parameters:

     Time taken = 10s

Unknown:

Depth of the well = ?

Solution:

To find the depth of the well, we apply the appropriate motion equation:

     h = ut + $\frac{1}{2}$gt²

h is the depth

u is the initial velocity

g is the acceleration due to gravity  = 9.8m/s²

t is the time taken

 Input the parameters and solve;

 The ball was dropped from rest; u = 0

      h  =  $\frac{1}{2}$gt²

      h  =   $\frac{1}{2}$ x 9.8 x 10²  = 490m