Wednesday

November 26, 2014

November 26, 2014

Posted by **John** on Thursday, September 22, 2011 at 4:47pm.

- physics -
**Steve**, Friday, September 23, 2011 at 10:41amFirst, get everything in the same units. The answer must be in m/sec^2, so we need to convert 170 km/hr to m/sec.

170 km/hr * 1000m/km * hr/3600sec = 47.222m/sec

Now, we know that it takes some time, t, to take off.

v = at

47.222 = at, so

t = 47.222/a

Distance s = 1/2 at^2

145 = 1/2 a (47.222/a)^2 = 2229.938/2a

290a = 2229.938

a = 7.69 m/sec^2

So, checking our answer

t = 47.222/7.69 = 6.14 sec

s = 1/2 * 7.69 * 6.14^2 = 144.955 m

Close enough for jazz.

**Answer this Question**

**Related Questions**

Physics - A jet plane has a takeoff speed of Vto=125km/h (34.72 m/s) and it's ...

physics - To take off from the ground, an airplane must reach a sufficiently ...

physics - An airplane requires 420 m of runway to take off from an airstrip. If ...

Physics - An airplane requires 420 m of runway to take off from an airstrip. If ...

physics - An airplane taking off from a landing field has run of 400 m. If it ...

physics - The airplane can take off when its airspeed (speed of the air flowing ...

physics - The airplane can take off when its airspeed (speed of the air flowing ...

Physics - The airplane can take off when its airspeed (speed of the air flowing ...

Physics - An airplane must reach a speed of 240.5 mi/h in order to take off. If ...

phys - An airplane must reach a speed of 185 mi/h to take off. If the runway is...