OCR Gateway A (9-1) P2.1.5 - Velocity-Time Graphs Summary

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OCR Gateway A revision video for Physics and Combined Science on P2 - Velocity-Time Graphs for the foundation and higher tier. First exams in 2018.
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can anyone else hear some creepy music at the beginning?

tasnymhaque
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1:49 Why is it +20 - 0?
How do you know that there is no change in acceleration? Is it because it is a straight diagonal line? If it was a curve there would be a change in velocity? In the exam, would there be a curved line?

Rafmee
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hi - I don't get when you're drawing the graph of a ball bouncing up and down why it goes all the way through the x axis - can you explain this to me please?

savannahberridge