In physics, what is the positive and negative sign used for when applied to velocity and acceleration?

the positive and negative signs are used to show different directions of acceleration and velocity

Explanation:

for example, if a car was moving forward, you would usually express it with a positive sign. If the car started moving backwards, you would show that backwards motion with a negative sign.

when the use of electricity burdens the fuse and miniarure circuit beakers and there is a possibility of a fuse then they automatically cut off the electricity supply to your homes and after you fix the problem u jzt switch it on and it continues the supply of electricity to ur homes

explanation:

v=uf/(u-f)

= 5.-10/(5+10) convex lens has negative focal length