Help - Q. 21 in 2002 HSC paper (1 Viewer)

[tieki]

Can anyone help me with the relation between acceleration and distance in this question? I can see it must be relatively simple, but I'm just not getting it...

For those of you without the paper, there is a cannon 215m long, and the "pod" fired out the end needs to be going 1.03 x 10^3 metres per second at the end of it - you need to find the acceleration needed for this to be possible.

 

[ND]

You've got:
s=215
u=0
v=1.03*10^3

Use v^2=u^2+2as

 

[tieki]

damn...I knew it was easy, but I just wasn't seeing it

Thanks