A person, travelling on a motorway a total distance of 200 km , travels the first 90 km at an average speed of $$\(80 \mathrm{~km} \mathrm{~h}^{-1}\)$$. Which average speed must be obtained for the rest of the journey if the person is to reach the destination in a total time of 2 hours 0 minutes?
A.
\(110 \mathrm{~km} \mathrm{~h}^{-1}\)
B.
\(120 \mathrm{~km} \mathrm{~h}^{-1}\)
C.
\(122 \mathrm{~km} \mathrm{~h}^{-1}\)
D.
\(126 \mathrm{~km} \mathrm{~h}^{-1}\)
Exam No：9702_w24_qp_11 Year：2024 Question No：6
Answer:
D
Knowledge points:
3.1.1 define and use distance, displacement, speed, velocity and acceleration
3.1.2 use graphical methods to represent distance, displacement, speed, velocity and acceleration
3.1.3 determine displacement from the area under a velocity-time graph
3.1.4 determine velocity using the gradient of a displacement-time graph
3.1.5 determine acceleration using the gradient of a velocity-time graph
3.1.6 derive, from the definitions of velocity and acceleration, equations that represent uniformly accelerated motion in a straight line
3.1.7 solve problems using equations that represent uniformly accelerated motion in a straight line, including the motion of bodies falling in a uniform gravitational field without air resistance
3.1.8 describe an experiment to determine the acceleration of free fall using a falling body
3.1.9 describe and explain motion due to a uniform velocity in one direction and a uniform acceleration in a perpendicular direction
Solution:
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