This video is a walkthrough of the Eastern Cape's 2023 preparatory exams physical sciences paper 1.

The question was as follows:
Two trolleys, A of mass 1 kg, and B of mass 2 kg, are held stationary on a smooth horizontal surface with a compressed spring between them, as shown in the diagram below. The spring is released and falls to the ground. Trolley A moves to the right at a constant velocity of 5,0 𝑚·𝑠^(−1) and collides with a wall.
Assume this is an isolated system.


1. Define an isolated system.
2. Calculate the velocity of trolley B immediately after the spring is released.
3. The average force exerted by the wall on trolley A is 80 N and the collision of the trolley with the wall lasts 0,5 seconds. Calculate the velocity with which trolley A moves away from the wall.
4. A learner comments that the collision of trolley A with the wall is inelastic. Briefly explain what is meant by an inelastic collision.

Chapters
0:00 Opening
01:40 Definition of isolated system
2:12 Calculate the velocity of trolley B immediately after the spring is released
4:50 Calculate the velocity with which trolley A moves away from the wall.
8:50 Definition of inelastic collision

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