A jet plane is cruising at 300 m/s when suddenly the pilot turns the engines up to full throttle. After traveling 4.0 km, the jet is moving with a speed of 400 m/s.What is the jet's acceleration, assuming it to be a constant acceleration?(adsbygoogle = window.adsbygoogle || []).push({});

first i converted 4km to m. then i said that since at first he was traveling 300m/s, it must of taken him about 13.33 seconds to reach 400m/s. then i followed the formula for average acceleration, which is vf-vi/tf-ti, and i get a wrong answer. what am i doing wrong?

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Formula for average acceleration

**Physics Forums | Science Articles, Homework Help, Discussion**