Projectiel Motion (1 Viewer)

[henry08]

Does anyoen have any tips/help on these? I failed at the 2005, 6 7 ones and was lucky to get 2 marks for the whoel PM questions.

 

[wookeh]

I owe you a huge apology right about now.
I didn't look at the forum this was in at all. I can do physics projectile motion, not ext 1. I don't even do ext 1, so yeah.
My apologies.

 

[ronnknee]

Don't memorise the formulae - most of the times, the "standard" set of equations won't suit the question
Instead, derive them and know how


Always start with the second derivative of y ie. y (double dot) = -g

Integrate it, y (dot) = -gt + C
Does it have an additional vertical velocity? If it does then let C = V sin @
Therefore y (dot) = -gt + V sin @

Integrate it again, y = -gt²/2 + Vt sin @ + C
Does it have an additional vertical displacement? If it does then let C = y₁
Therefore y = -gt²/2 + Vt sin @ + y₁

Similarly, do the same for the x component