A rock is dropped from a high building. The acceleration due to gravity is -10m/s. Find the distance travelled by this rock from t = 2s to t = 4s. Help!?
1 Answer
Aug 21, 2017
It travels 60 m.
Explanation:
I will take the liberty of making this correction: "The acceleration due to gravity is -10m/s^2". Using the kinematic formula
we can find that at
t = 2s,
and
t = 4s,
The next (and final) step is to find the distance it traveled in a 2 sec period, starting with an initial speed of -20 m/s and ending with final speed of -40 m/s. Using the kinematic formula
we can find that
Since the question is asking about distance, which is not a vector, rather than displacement, we can drop the minus sign. So it travels 60 m.
I hope this helps,
Steve