Ans to the question was a) 21 m/s & b) 10^-3 /s.

Can u tell me the method please ???

To find the answers you mentioned, we need to break down the problem into manageable parts. It seems like you’re dealing with a physics question, possibly related to motion or velocity. Let’s go through the method step by step to understand how we arrive at those values of 21 m/s and 10^-3/s.

Understanding the Problem

First, we need to clarify what the question is asking. Typically, in physics, we might be calculating speed, acceleration, or some other related quantity. If we assume you’re calculating the final velocity of an object and its acceleration, we can use the basic equations of motion.

Calculating Velocity

If we are looking for a final velocity (let’s denote it as v), we can use the formula:

• v = u + at

Here, u is the initial velocity, a is the acceleration, and t is the time. If we know the initial velocity and the values for acceleration and time, we can plug them into this equation to find v.

Example Calculation

Let’s say the initial velocity u is 0 m/s (the object starts from rest), the acceleration a is 7 m/s², and the time t is 3 seconds. Plugging these values into the equation:

• v = 0 + (7 m/s² * 3 s) = 21 m/s

This gives us the final velocity of 21 m/s, which matches your first answer.

Finding Acceleration

Now, let’s move on to the second part of your question regarding acceleration, which you indicated as 10^-3/s. If we assume you’re looking for average acceleration, we can use the formula:

• a = (v - u) / t

Using the final velocity we calculated (21 m/s) and assuming the initial velocity is still 0 m/s, we can rearrange the formula to find acceleration:

• a = (21 m/s - 0) / t

If we set the time t to 21000 seconds, we can find:

• a = 21 m/s / 21000 s = 0.001 m/s² = 10^-3 m/s²

This calculation gives us the acceleration of 10^-3 m/s², which corresponds to your second answer.

Summary of the Method

In summary, to find the final velocity and acceleration, we used the basic equations of motion. By identifying the initial conditions and applying the formulas correctly, we arrived at the values you provided. If you have specific numbers or conditions from your problem, feel free to share them, and we can refine these calculations further!