This video is a walkthrough of the Gauteng Province's 2021 preparatory exams physical sciences paper 1.

The question:
A car with a mass of 900 kg is moving east and collides with a free-standing barrier that has a mass of 3 200 kg. Study the following momentum-time graph of the car and the barrier below and answer the questions that follow.

1. State the law of conservation of linear momentum in words. 2. Use the information given on the graph and calculate the:
i. Final speed and direction of the car
ii. Impulse on the car
3. Is this collision elastic or inelastic? Use calculations to verify your answer.

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