Can someone check this question for me?

[Tygra]

Hi there,

I have recently made my own Youtube channel, and at the moment I am going through the kinematic topic of projectiles.

I have modelled a example problem that I would like to run by someone to see if I myself have done it correctly.

Here are some screen shots of the problem:

My main question is, have I correctly taking into account the elevated height of the projectile? Does S = y + 4.5m?

Many thanks

 

[blamocur]

What is the value of [imath]y[/imath] when [imath]x=0[/imath] ?
Also, I don't understand how you got your coefficient for [imath]x^2[/imath], but I get a different one.

 

[blamocur]

Also, I don't understand how you got your coefficient for x2x^2x2, but I get a different one.

I have to apologize for this one: after a brief revision I do get -49/64000 too. But my first question still stands.

 

[Tygra]

I have to apologize for this one: after a brief revision I do get -49/64000 too. But my first question still stands.

I get - 4.5 metres, Blamocur. But I guess I need positive 4.5 metres!

 

[blamocur]

I get - 4.5 metres, Blamocur. But I guess I need positive 4.5 metres!

Depends on where [imath]y[/imath] is measured from.