Projectile Motion Questions with Quadratic Formula (1 Viewer)

[acevipa]

Is there a way of doing projectile motion questions using the quadratic formula.

Also, am I allowed to use 3 unit maths formula's to do projectile motion questions in the physics HSC exam.

 

[darkchild69]

Short answer to both:

Yes

When using s = ut + 1/2at^2

If s is not zero, then you can use quadratic formula to find t

 

[alcalder]

You are allowed to use any valid way of finding the correct answer.

If you do 4Unit, can I recommend you do it that way (from first principles) and create your equations for each specific situation. Not a lot of thought needed to do them, then.

 

[daryl-d]

find the time taken to reach max height.... find max hieght and then pretentend the object was launced from that height (ie coz v=0) as all objects accelerate at the same rate on earth.

then add the two times together and there youre time of flight, even when the object was projected from a height..... and hey presto u dont have to use the quadraatic formula...

personally I think the formula is the way to go