Three students carry out an investigation to determine their powers when running up stairs - Edexcel - GCSE Physics - Question 6 - 2022 - Paper 1

The unit for work done is Joules (J).

To calculate the weight of student B, use the formula for work done, which is given by:

$Work = Weight imes Distance$

Rearranging gives:

$Weight = \frac{Work}{Distance} = \frac{1960 J}{4.5 m} \approx 435.56 N$

Thus, the estimated weight of student B is approximately 436 N.

Using the work done formula:

$Work = Weight \times Distance$

We can calculate the time taken by student C using:

$Power = \frac{Work}{Time}$

Thus rearranging gives:

$Time = \frac{Work}{Power} = \frac{2040 J}{510 N} = 4.0 s$

Therefore, student C takes 4.0 seconds.

The average power is calculated by summing up the powers and dividing by the number of students:

1. First, find the total power: $440 W + 436 W + 425 W = 1301 W$

2. Then, divide by the number of students: $Average Power = \frac{1301 W}{3} \approx 433.67 W$

So the average power of the students is approximately 434 W.

A significant source of error could be the estimation of weight. This error can be reduced by using scales to measure actual weight accurately.