Physics formulas in projectile motion (1 Viewer)

[Smilebuffalo]

I saw in the Couchman textbook that the physics formulae:

v = u + at
s= ut + 1/2at^2
v^2 = u^2 + 2as

are used in solving some projectile motion questions.

Is using physics formulae (specifically in the HSC) a legitimate method of doing these projectile motion questions, or should we stick to the other mathematical methods (horizontal motion, vertical motion, time of flight etc)?

 

[shady145]

well u can derive the formulas easily so i'd just stick with MX1 way...

 

[kaz1]

In that exercise you're supposed to use the Physics formulas. But in a Maths exam you are not allowed to just state those formulas.

 

[Drongoski]

Also remember those formulae apply to constant acceleration 'a' only.

 

[annabackwards]

Also remember those formulae apply to constant acceleration 'a' only.

But in mxt1 'a' = 9.8 or 10 XD

I'd use maths method to get the answer as marks are usually given for working out

 

[Michaelmoo]

Yer. I think they've made it perfectly clear they want the x as a function of t equations derived.

But theres nothing stopping you from checking your answers with the physics formulas. Thats what I do sometimes.

 

[cutemouse]

Also remember those formulae apply to constant acceleration 'a' only.

In MX1 'a' or 'g' is constant anyway, otherwise we'd be dealing with elliptical trajectories.