Aforce of 45 n is exerted on an object, resulting in an acceleration of 5 m/s2 for the object. what will the object's acceleration be if the force doubles?

Newton's 2nd law of motion:

                             Force = (mass) x (acceleration) .

Looking at that equation, you can see that if the mass doesn't change,
then the acceleration is proportional to the force.

If the force doubles, then the acceleration doubles, to 10 m/s² .

Jet streams are relatively narrow bands of strong wind in the upper levels of the atmosphere. the winds blow from west to east in jet streams but the flow often shifts to the north and south. jet streams follow the boundaries between hot and cold air. the earth's rotation is responsible for the jet stream as well.