Question

How far will a free falling object fall in 8.7 secs if it started from rest? Remember acceleration is negative for free fall. Do not use a negative number for "how far" the object fell.

Answer 1

h~=371.26m

Step-by-step explanation:

when an object falls we use the equations of accelerated motion. There is only one that gives distance.

`x = ut + (1)/(2) a {t}^(2)`

Since we have no initial velocity (started from rest) we can get rid of the (ut) term

where a we substitute g (gravitational acceleration, constant for given heights and almost 9.81m/s^2).

`h = (1)/(2) g {t}^(2) = (1)/(2) * 9.81 * {8.7}^(2) = 371.26m`