| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.HL.TZ0.7 |
| Level | Higher level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 7 | Adapted from | N/A |
Question
A speed boat tows a water skier so that the skier accelerates.
The magnitude of the force exerted on the skier by the tow rope must be
I. greater than the magnitude of the total resistive force acting on the skier
II. equal to the magnitude of the force exerted on the tow rope by the skier
III. equal to the magnitude of the force causing the boat to accelerate.
Which of the above factors is/are correct?
A. I and II only
B. I and III only
C. II only
D. III only
Markscheme
A
Examiners report
Response B was popular here despite D not being so. This would mean that the accelerating force would be the same on the skier and the boat despite significant difference in mass and both moving together.
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