Question

A penny is dropped off the top of the Stratosphere from rest and falls freely with the

acceleration due to gravity (9.81 m/s2). After 5 seconds, how far has it fallen (Ax)?

Answer 1

S = 122.5m

Step-by-step explanation:

Given the following data;

Acceleration due to gravity = 9.8m/s²

Time, t = 5 seconds

Since it's a free fall, initial velocity, u = 0

To find the displacement, we would use the second equation of motion given by the formula;

`S = ut + \frac {1}{2}at^(2)`

Where;

• S represents the displacement or height measured in meters.

• u represents the initial velocity measured in meters per seconds.

• t represents the time measured in seconds.

• a represents acceleration measured in meters per seconds square.

Substituting into the equation, we have;

`S = 0*5 + \frac {1}{2}*(9.8)*5^(2)`

`S = 0 + 4.9*25`

S = 122.5m.