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**An airplane has 1.50x10³ m to accelerate to a speed of 62.0 m/s to take off. If it experiences 15,000N of friction, calculate the thrust of the engines.**

d=1.50x10³ m

v

_{i}=0 m/s

v

_{f}=62.0 m/s

F

_{f}=15,000N

v²=u²+2ad

62²=0+2(1.50x10³)a

a=1.2813 m/s²

I think I'm supposed to find the applied force, but I don't know what to do next since I can't find the mass of the airplane.

**A 4.5kg axe comes to a stop in a tree from 25 m/s. How much force did the tree exert on the axe?**

I couldn't come up with anything for this one:

u=25 m/s

v=0 m/s

m=4.5 kg

ANY HELP IS MUCH APPRECIATED!

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