Date | November 2020 | Marks available | 2 | Reference code | 20N.1.SL.TZ0.S_7 |
Level | Standard Level | Paper | Paper 1 (without calculator) | Time zone | Time zone 0 |
Command term | Find | Question number | S_7 | Adapted from | N/A |
Question
In this question, all lengths are in metres and time is in seconds.
Consider two particles, and , which start to move at the same time.
Particle moves in a straight line such that its displacement from a fixed-point is given by , for .
Find an expression for the velocity of at time .
Particle also moves in a straight line. The position of is given by .
The speed of is greater than the speed of when .
Find the value of .
Markscheme
* This question is from an exam for a previous syllabus, and may contain minor differences in marking or structure.
recognizing velocity is derivative of displacement (M1)
eg
velocity A1 N2
[2 marks]
valid approach to find speed of (M1)
eg , velocity
correct speed (A1)
eg
recognizing relationship between speed and velocity (may be seen in inequality/equation) R1
eg , speed = | velocity | , graph of speed , speed velocity
correct inequality or equation that compares speed or velocity (accept any variable for ) A1
eg
(seconds) (accept , do not accept ) A1 N2
Note: Do not award the last two A1 marks without the R1.
[5 marks]