| Exam Board | AQA |
|---|---|
| Module | M2 (Mechanics 2) |
| Year | 2011 |
| Session | June |
| Marks | 7 |
| Paper | Download PDF ↗ |
| Topic | Work done and energy |
| Type | Projectile energy - basic KE/PE calculation |
| Difficulty | Moderate -0.8 This is a straightforward application of conservation of energy with clearly stated conditions. Part (a) requires only direct substitution into KE = ½mv², and part (b) involves a standard energy conservation equation with given heights and masses. No problem-solving insight or complex multi-step reasoning is required—just routine application of memorized formulas. |
| Spec | 6.02d Mechanical energy: KE and PE concepts6.02i Conservation of energy: mechanical energy principle |
1 In an Olympic diving competition, Kim, who has mass 58 kg , dives from a fixed platform, 10 metres above the surface of the pool. She leaves the platform with a speed of $2 \mathrm {~m} \mathrm {~s} ^ { - 1 }$.
Assume that Kim's weight is the only force that acts on her after she leaves the platform. Kim is to be modelled as a particle which is initially 1 metre above the platform.
\begin{enumerate}[label=(\alph*)]
\item Calculate Kim's initial kinetic energy.
\item By using conservation of energy, find Kim's speed when she is 6 metres below the platform.
\end{enumerate}
\hfill \mbox{\textit{AQA M2 2011 Q1 [7]}}