Two persons of equal weight are running at speeds of `4ms^-1` and `5ms^-1`, respectively. Both increase their speeds by `1ms^-1` in a time span of `10s`. Who does more work? Who develops more power?

Explanation

To solve the problem, we need to calculate the work done and power developed by each person as they increase their speeds. We will follow these steps:

### Step 1: Calculate the initial kinetic energy for both persons.
The kinetic energy (KE) is given by the formula:
\[ KE = \frac{1}{2} mv^2 \]
where \( m \) is the mass (or weight, since they have equal weight) and \( v \) is the velocity.

Let’s denote the weight of each person as \( W \) (which is equal for both). The mass \( m \) can be expressed as \( m = \frac{W}{g} \), where \( g \) is the acceleration due to gravity. However, since we are comparing two persons of equal weight, we can ignore \( m \) and simply focus on the change in kinetic energy.
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