Question

calculate the speed of an 8.0x10^4 kg airliner with a kinetic energy of 1.1x10^9 j

Answer 1

What is the formula for kinetic energy?

Answer 2

KE=Fd right? but i would have to use the equation KE=.5mv^2 right?

Answer 3

Yes, kinetic energy of a mass m moving at a speed v is
\[ KE = \frac{1}{2} mv^2 \]

Now, you have KE and m. Solve for v.

Answer 4

i did and my final answer was 165.83 but when i researched the question online it doesn't seem to be correct..

Answer 5

v = 165.8 m/s is correct. Maybe however, the question is asking you to express speed as km/hr or something else.

Answer 6

ohh right ! thanks !!

Answer 7

v = 165.8 m/s