Posted by **kayla** on Thursday, September 15, 2011 at 8:02pm.

An airport has runways only 142 m long. Asmall plane must reach a ground speed of 45 m/s before it can become airborne. What average acceleration must the plane’s engines provide if it is to take off safely from its airport?Answer in units of m/s2.

- physics -
**bobpursley**, Thursday, September 15, 2011 at 8:05pm
Vf^2=Vi^2+2ad solve for a

- physics -
**kayla**, Thursday, September 15, 2011 at 8:20pm
i do not understand that formula bob

i got 0.317 what do you get cause mine is wrong

- physics -
**bobpursley**, Thursday, September 15, 2011 at 8:29pm
Vf=45

Vi=0

d=142

45^2=2*a*142

solve for a.

Yep, yours is way wrong.

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