The projectile motion question (2 Viewers)

[JhK89]

omg i got it right!

 

[jed.hamers]

Yay, got it right too, all of them. Just refined/ learned properly how to do this morning. Woo hoo

 

[s2indie]

Yes!

 

[skyline]

mannn how did u work out the time, anyone????:rofl:

 

[vnblueberry]

was it required to put the angle of the initial projection down?

 

[helper]

mannn how did u work out the time, anyone????:rofl:

vertical displacement=0
0=40t-o.5*9.8t²

was it required to put the angle of the initial projection down?

No as it asked for magnitude

 

[XcarvengerX]

I believe the markers will look at your significant figure. For this question, it is 2 significant figure. So if you got 367.2m for (d), then it should be 370 for 2 significant figure. My ex-HSC marker chemistry teacher (I know this is physics but this still applies) said if you don't round your answer off for any HSC science subjects then you may be penalised (but max 1 mark for the whole paper).

 

[dunno04]

Oh yea.
I got it right
BUt aren't u suppose to put it into 2 D P?

 

[XcarvengerX]

No, it is 2 significant figure, NOT 2 decimal place.

 

[charismo]

thats exactly what i got.. rock on

 

[princess M]

I got:

a) 45ms^-1

b) 60.2ms^-1

c) max height = 81.6m

d) Range = 367.2m

i got that! someone has the same answers!!

i took me ages... last time i practised projectile was for half-yearlies....

 

[meekzy89]

i dont think ive ever done an easier projectile motion question . EVER!

since they already worked out the components for us.
LMAO!
fools!

so the rest was easy!
as long as u knew how 2 use the formulas!

 

[myeewyee]

Projectile motion in the physics course is EASY. As long as you do 2u maths there shouldn't be anything to worry about... (in terms of the level of equation solving you have to do)

 

[Rax]

Time of flight
v=u + at

0 at top of motion, for half, times bye two.....woo hoo

gg

 

[easyway]

can someone tell me what the projectile question was exactly
i thought i got it right but maybe i didn't answer the first part.
Did they ask for initial velocity? since they gave the horizontal and vertical motion or did they ask the final velocity?

 

[myeewyee]

the first part asked for final horizontal velocity (from memory) which is the same as initial horizontal velocity.

 

[Jono_2007]

can someone tell me what the projectile question was exactly
i thought i got it right but maybe i didn't answer the first part.
Did they ask for initial velocity? since they gave the horizontal and vertical motion or did they ask the final velocity?

Q16)A projectile leaves the gound at 40m/s (y-axis) and 45m/s (x-axis). Marks
a)State the horizontal component of the projectile's velocity when it lands. 1
b)Find the magnitude of the initial velocity of the projectile. 1
c)Calculate the maximum height attained by the projectile. 2
d)Calculate the range of the projectile, if it lands level with it's starting position. 2


Having just started projectile motion in 4th term yr11, our teacher decided to give us the 2006 HSC projectile motion question for homework? and ~shinigami~ is right!

 

[~shinigami~]

Having just started projectile motion in 4th term yr11, our teacher decided to give us the 2006 HSC projectile motion question for homework? and ~shinigami~ is right!

You too? I guess most people are learning projectile motion first.

 

[Jono_2007]

You too? I guess most people are learning projectile motion first.

Well no, second actually, we have already finished section one, but otherwise yes most people do the space core modual first and that seems logical, since it's listed first in the syllabus. I found that question comparitively easy, relative to other past HSC papers.

 

[tunawalker]

My teacher was like "You will never get a projectile mmotion question in the HSC where the projectile is launched from and lands on the same level"

Proved her wrong, hey?