2 (a) (i) Which of these is the correct equation that relates force, mass and acceleration? A F = m + a B F = m - a C F = m x a D F = m + a (ii) A cyclist has a mass of 70kg - Edexcel - GCSE Physics Combined Science - Question 2 - 2020 - Paper 1

To find the force needed, we use the formula:

$F = m \times a$

Given:

• Mass (m) = 70 kg
• Acceleration (a) = 2.0 m/s²

Substituting in the values:

$F = 70 \text{ kg} \times 2.0 \text{ m/s}^2 = 140 \text{ N}$

The unit for force is Newtons (N).

To calculate the average speed, we use the equation:

$\text{average speed} = \frac{\text{distance}}{\text{time}}$

Given:

• Distance = 1200 m
• Time = 80 s

Substituting in the values:

$\text{average speed} = \frac{1200 \text{ m}}{80 \text{ s}} = 15 \text{ m/s}$

Therefore, the average speed of the cyclist is 15 m/s.