| Exam Board | CAIE |
|---|---|
| Module | M1 (Mechanics 1) |
| Year | 2011 |
| Session | June |
| Marks | 5 |
| Paper | Download PDF ↗ |
| Mark scheme | Download PDF ↗ |
| Topic | Work done and energy |
| Type | Lifting objects vertically |
| Difficulty | Easy -1.2 This is a straightforward work-energy question requiring only direct application of W = mgh for gravitational potential energy, adding resistance work, and using Power = Work/time. All steps are routine calculations with no problem-solving insight needed, making it easier than average. |
| Spec | 6.02a Work done: concept and definition6.02d Mechanical energy: KE and PE concepts6.02l Power and velocity: P = Fv |
2 A load of mass 1250 kg is raised by a crane from rest on horizontal ground, to rest at a height of 1.54 m above the ground. The work done against the resistance to motion is 5750 J .\\
(i) Find the work done by the crane.\\
(ii) Assuming the power output of the crane is constant and equal to 1.25 kW , find the time taken to raise the load.
\hfill \mbox{\textit{CAIE M1 2011 Q2 [5]}}