The only 'difference' is that they are different categories.
It's like asking "What's the difference between Susie and girl ?"
Or "What's the difference between Cadillac and car ?"
Displacement <em>IS</em> a vector quantity.
<u>Answer:</u>
The spaceship's position when the engine shuts off = 
<u>Explanation:</u>
Initial location of spaceship = (600 i - 400 j + 200 k)*
= (600 i - 400 j + 200 k)*
Initial velocity = 9500 i m/s
Acceleration = (40 i - 20 k)
Time = 35 minute = 35 * 60 = 2100 seconds
We have equation of motion , 
, s is the displacement, u is the initial velocity, a is the acceleration and t is the time.
Substituting
So final position = 
=
The spaceship's position when the engine shuts off =
1). Work = (force) x (distance)
Work = (3,000 newtons) x (35 meters) = 105,000 newton-meters = <em>105,000 joules</em>
2). Power = (work) / (time)
Power = (105,000 joules) / (90 seconds)
= 1,166-2/3 joules per second =<em> 1,166 and 2/3 watts</em> .
<em>Note:</em>
That's no ordinary man.
1,166 watts is the same as roughly 1.6 horsepower.
Not too many people can sustain 1 horsepower or more for 90 seconds.
