A rock is dropped from the top of a building. Rock starts from rest and it takes 7 seconds to reach the ground. How far did the rock travel in 7 seonds. Ignore air drag and friction. Use g =9.8m/s2.
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A rock is dropped from the top of a building. Rock starts from rest and it takes 7 seconds to reach the ground. How far did the rock travel in 7 seonds. Ignore air drag and friction. Use g =9.8m/s2. (Don't round your answer). Choose correct answer with the correct unit.
| A. |
240.1 m/s |
|
| B. |
240.1 m |
|
| C. |
34.3 m/s |
|
| D. |
34.3 m |
Given: The initial speed of the rock is zero.
The time taken by the rock to reach the ground is 7 seconds.
To determine: The distance the rock travel.
The kinematic equation to calculate the distance is
where s is the distance, u is the initial speed, t is the time and a is the acceleration.
Here, the rock is dropped from the top of a building thus, the acceleration is acceleration due to gravity (g).
So, the equation becomes
................................. (1)
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