Question

When is acceleration taken as negative

Answer 1

When an object is speeding up, the acceleration is in the same direction as the velocity. Thus, this object has a positive acceleration. In Example B, the object is moving in the negative direction (i.e., has a negative velocity) and is slowing down.

Answer 2

Answer:

Acceleration is defined as the change in the velocity of an object over the change in time.

Explanation:

Acceleration is the rate of doing work. Acceleration is use to measure the velocity of an object with respect to time and expressed in meters per second squared (m/s^2). Acceleration is a vector quantity and having both direction and magnitude.

formula for acceleration is:

                       a = Δv/Δt

where,

Acceleration = a

change in velocity = Δv

change in time = Δt,

An acceleration will be taken as negative if the object is moving in the opposite direction of the motion.

for example: a car is moving at 2 meter per second then in 2 seconds its velocity decreases to 4 meter per second then the acceleration will be -1 meter per second.

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