An object is projected from horizontal ground at a velocity of magnitude $$\(u\)$$ and angle $$\(\theta\)$$ to the horizontal. It hits the ground at a time $$\(t\)$$ after it is projected. Assume air resistance is negligible. Which statement does not describe the motion of this object?
A.
The horizontal component of the object's velocity is constant and has the value \(u \cos \theta\).
B.
The horizontal distance travelled by the object is \(t u \cos \theta\).
C.
The time taken for the object to reach maximum height is \(\frac{t}{2}\).
D.
The vertical component of the object's velocity is constant and has the value \(u \sin \theta\).
Exam No：9702_w24_qp_11 Year：2024 Question No：5
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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