When both the velocity and the acceleration vectors are positive, a
Oь
the object is at rest
the object is speeding up to the right direction
the object is speeding up to the left direction
the object is slowing down to the right direction
с
Od

The object is speeding up in the direction of motion

Explanation:

An object which moves in the positive direction has a positive velocity. If the object is speeding up, then its acceleration vector is directed in the same direction as its motion (in this case, a positive acceleration).

b.a device that inputs heat into a cool object

the closer the planet is to the sun, the larger the gravity