Question

A 747 jetliner lands and begins to slow to a stop as it moves along the runway. If its mass is 3.50*10^5 kg, its speed is 27.0 m/s, and the net braking force is 4.30*10^5 N, (a) what is the speed 7.50 seconds later? (b) How far has it traveled in this time?

Answer 1

Lay it all out on the table. List what initial and final values you have. Then draw a picture. I do this every time I attempt a physics problem because juggling all of that around in my head doesn't give me the clarity I need to see what I have.

Write out what equations you know that might be helpful and start using these pieces to solve your problem. Force is involved, distance, speed, mass, what equations might be useful? What kind of answer can we expect here? It's slowing down right, so it wouldn't make sense for the final speed to be larger than the initial speed, things like that.

Turn the word problem as much into just variables, equations, and diagrams and you'll be a lot happier when solving it. Don't worry about being messy. Waste as much paper as you have to, being neat is just holding back possible solutions you might have. Juggling things around in your mind in an attempt to be neat and have a nice looking paper are the devil to a physics problem. Just get it out there and rework it on a nice clean sheet when you're done if you really care.

Answer 2

1 st Find the acceleration!

Answer 3

F = m*a

Answer 4

use this relation.!!

Answer 5

@Kainui

Answer 6

Yes? I have given my advice already, I'm done here until the asker responds and shows as much effort as I have in this problem. lol =P