| Exam Board | AQA |
|---|---|
| Module | M2 (Mechanics 2) |
| Year | 2013 |
| Session | June |
| Marks | 8 |
| 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 signposted steps. Part (a) is direct KE formula substitution, part (b) adds gravitational PE to KE (basic energy conservation), and part (c) reverses the KE formula. All three parts are routine calculations requiring only standard formulas with no problem-solving insight or multi-step reasoning. |
| Spec | 6.02d Mechanical energy: KE and PE concepts6.02e Calculate KE and PE: using formulae6.02i Conservation of energy: mechanical energy principle |
2 Carol, a circus performer, is on a swing. She jumps off the swing and lands in a safety net. When Carol leaves the swing, she has a speed of $7 \mathrm {~ms} ^ { - 1 }$ and she is at a height of 8 metres above the safety net.
Carol is to be modelled as a particle of mass 52 kg being acted upon only by gravity.
\begin{enumerate}[label=(\alph*)]
\item Find the kinetic energy of Carol when she leaves the swing.
\item Show that the kinetic energy of Carol when she hits the net is 5350 J , correct to three significant figures.
\item Find the speed of Carol when she hits the net.
\end{enumerate}
\hfill \mbox{\textit{AQA M2 2013 Q2 [8]}}