1 The picture shows a weight lifter - Edexcel - GCSE Physics - Question 1 - 2012 - Paper 1

Using the formula for gravitational potential energy:

$$E = mgh$$

Where:

• $E$ is energy (in Joules)
• $m$ is mass (in kg)
• $g$ is gravitational field strength (in N/kg)
• $h$ is height (in meters)

We know:

• $E = 5040 \text{ J}$
• $m = 240 \text{ kg}$
• $g = 10 \text{ N/kg}$

We need to rearrange the formula to solve for height ($h$):

$$h = \frac{E}{mg}$$

Substituting the values:

$$h = \frac{5040 \text{ J}}{240 \text{ kg} \times 10 \text{ N/kg}} = \frac{5040}{2400} = 2.1 \text{ m}$$

Therefore, the height he lifts this mass is:

height = 2.1 m