Answer:

Explanation:
Given data
Flight distance S=4890 km
Time difference Δt=t₂-t₁=40 min
Air speed of plane=980 km/h
To find
Speed of jet stream
Solution
When moving in the same direction as the jet stream time taken as t₁=d/(v+vs),v is velocity of plane and vs is velocity of plane
While moving in opposite direction t₂=d/(v+vs)
So

Apply quadratic formula to solve for vs
So
Explanation:
if two individual forces are of equal magnitude and opposite direction, then the force is said to be balanced. when there is an individual force that is not being balanced by a force of equal magnitude and in the opposite direction.
Well he could remove the drawers to make it lighter, which causes less friction
Suppose a bug is sitting on a plane. To someone right next to the bug, the bug appears to not move, but a man from the ground would see the bug going as fast as the plane. It is relative, meaning it appears different to two different people.
Gravity is pulling the book towards the center of the earth, and the rebounding effect of the table cancelling out gravity allowing for the book to sit at rest.