Recent content by helloworld2941

Wait that's such a good way of thinking about. I've never learnt of it like that

Thank you, I understand it for this question now. But then in scenarios where a ball is projected upwards, would the acceleration due to gravity be positive or negative?

okay I annotated the diagram given and the grey thing where they take y axis up as positive is what I understand to be, right? But in the answers, they start off by going V = u - gt. They've taken acceleration due to gravity as a negative value. Why? I thought the skateboarder was falling...

So they are not mutually exclusive factors? I think I understand it now. Thanks for your help!

That's such a simple but informative video! Thank you

At 3m: U = 3 x 9.8 x 80 = 2352J U at 6m = 6 x 9.8 x 80 = 4704J k = 1/2mv^2 (4704-2352)J = 1/2 (80) v^2 v = 7.67 m/s At 0m (bottom): U = 0 4704J = 1/2 (80) v^2 = 10.84 m/s Okay so what is bothering me here is just that my working doesn't take into account the...