The muscle power in watts per kg is calculated using the following equation: muscle power = \( 9.8 \times \text{jump height} \div \text{time} \) One volunteer has a muscle power of 41 W/Kg He was in the air for 0.12 s Calculate his jump height - AQA - GCSE Physics - Question 11 - 2019 - Paper 1

The equation linking kinetic energy (( E_k )), mass (m), and speed (v) is:

[ E_k = \frac{1}{2} m v^2 ]

To find the mass of the volunteer, we rearrange the kinetic energy equation:

[ m = \frac{2 E_k}{v^2} ]

Substituting the known values:

[ m = \frac{2 \times 270}{(3.0)^2} = \frac{540}{9} = 60 \text{ kg} ]

Thus, the mass is 60 kg.

From the data in Figure 19:

• Males typically have a higher muscle power than females for most of their lives.
• Specifically, males have greater muscle power than females before the age of 10.
• After age 10, males maintain higher muscle power levels, reaching a peak around 25 years of age, while females peak earlier at age 20.
• At age 9/10, both genders have similar muscle power readings, but males seem to gain an advantage as they grow older.
• The decline in muscle power is steeper for males after 25 years than for females.

One reason for recording the highest muscle power reading instead of calculating an average could be to emphasize the peak performance of the volunteers at their best, which may be more indicative of their maximum ability than an average that might include lower readings.