Answer :

Final Answer:

The rock will be 5 m from the ground level at 2.31 s.

The correct answer is option b) 2.31 s

Explanation:

To determine the time it takes for the rock to reach 5 meters from the ground level, we need to analyze the situation using the concept of motion under constant acceleration. In this case, the rock experiences a constant acceleration due to gravity, which is approximately 9.81 m/s².

First, let's establish the initial conditions. We know that the rock starts at the ground level (0 m) and we want to find the time when it reaches 5 m above the ground. Therefore, the change in height (Δh) is 5 m.

Now, we can use the equation for motion under constant acceleration, which is:

Δh = h + 0.5 * a * t²

Where Δh is the change in height, h is the final height, a is the acceleration, and t is the time taken to reach the final height.

We need to find the value of t. Rearranging the equation to solve for t, we get:

t = sqrt(2 * (Δh - h) / a)

Plugging in the values, we have:

t = sqrt(2 * (5 - 0) / 9.81)

t = sqrt(10 / 9.81)

t ≈ 2.31 s

So, the rock will be 5 m from the ground level at approximately 2.31 seconds.

Therefore, the correct answer is option b) 2.31 s

Thanks for taking the time to read At what time will the rock be 5 m from ground level A 1 69 s B 2 31 s C 3 12 s D. We hope the insights shared have been valuable and enhanced your understanding of the topic. Don�t hesitate to browse our website for more informative and engaging content!

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