2 (a) Which of these is the equation for work done? A work done = force ÷ distance moved in direction of force B work done = force × distance moved in direction of force C work done = force × distance moved at right angles to direction of force D work done = force × distance moved at right angles to direction of force (b) A ball has a mass of 0.046 kg - Edexcel - GCSE Physics - Question 2 - 2019 - Paper 1

To calculate the change in gravitational potential energy (ΔGPE), we use the formula:
$\Delta GPE = m \times g \times \Delta h$
Where:

• m = mass of the ball = 0.046 kg
• g = acceleration due to gravity ≈ 9.81 m/s²
• Δh = height = 2.05 m
  Now substituting the values into the equation:
  $\Delta GPE = 0.046 \times 9.81 \times 2.05$
  Calculating this gives:
  $\Delta GPE ≈ 0.93 \, ext{J}$

The formula to calculate kinetic energy (KE) is given by:
$KE = \frac{1}{2} m v^2$
Where:

• m = mass of the ball = 0.046 kg
• v = speed of the ball = 3.5 m/s
  Substituting the values into the equation, we have:
  $KE = \frac{1}{2} \times 0.046 \times (3.5)^2$
  Calculating this yields:
  $KE ≈ 0.27 \, ext{J}$