IB Physics HL A 1 5 Instantaneous and Average Values Questions

Practise IB Physics HL A.1.5 by analysing instantaneous values and vector averages across changing, multi-stage motion.

Exam points

Describe and interpret position, velocity and acceleration in one-dimensional motion using equations, vectors and motion graphs.
Use gradients and areas on displacement–time and velocity–time graphs to determine motion quantities.

[Maximum number: 3]

This question is in two parts. Part 1 is about kinematics and gravitation. Part 2 is about radioactivity.

Part 1 Kinematics and gravitation

A ball is released near the surface of the Moon at time t=0. The point of release is on a straight line between the centre of Earth and the centre of the Moon. The graph below shows the variation with time t of the displacement s of the ball from the point of release.

Figure for Question IB Physics HL A 1 5 Instantaneous and Average Values Questions question 1 — IB Physics HL

Use the graph to

estimate the velocity of the ball at $t=0.80 \mathrm{~s}$ .

tangent drawn to curve at 0.80 s ;
correct calculation of gradient of tangent drawn;
$-1.3 \pm 0.1 \mathrm{~m} \mathrm{~s}^{-1}$ or $1.3 \pm 0.1 \mathrm{~m} \mathrm{~s}^{-1}$ downwards;
or
correct coordinates used from the graph;
substitution into a correct equation;
$-1.3 \pm 0.1 \mathrm{~m} \mathrm{~s}^{-1}$ or $1.3 \pm 0.1 \mathrm{~m} \mathrm{~s}^{-1}$ downwards;

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IB Physics HL A 1 5 Instantaneous and Average Values Questions question 1