Hey there how would I find the height of the platform of this question?
I got the gradient = 0.73 which should give me the time I need to sub into one of the projectile equations. I'm just not sure which one to use and how direction plays into this because i'm putting -9.8 for g but then that gives me a negative distance (delta y) so i'm really confused???
Any help would be great!
You did the right thing! You would have gotten about -2.5 metres? That represents the fact that, after the time of flight, you are
2.5 metres BELOW your launch point. It's because the projectile is lower than when you started
Height of the platform is about 2.5 metres
Hey me again,
Sorry if this is really stupid but how would you count the dots in a question like this? Would you count the first one on the right or not because it's when the initial velocity is 0 i.e. when t=0 - or am I completely overthinking this - please help
EDIT: I've attached the relevant questions and my answers - if someone could please help me out with c and check the rest I'd really appreciate it!!(Image removed from quote.)
You are over thinking a bit I think
counting an extra dot will only make a slight difference to your estimates and thus your calculations, so I don't think it would matter!
For C - You need to identify that the horizontal velocity is constant. You can tell because the horizontal distance between each of your dots is relatively constant
The others look good on a quick glance - Your first one it is 0.67m below the HIGHEST point, not the initial point (you've redefined the origin to be the peak point by using the formula in that way). So just 0.67 metres should be the answer. For D, you might need to include the horizontal component of velocity as well using pythagoras?