Q. 95.0( 2 Votes )

# When do you say that an object has negative acceleration?

When an object decreases its speed it is said to be undergoing negative acceleration/retardation.

Explanation:

Acceleration is defined as,

Where vf is the final velocity

vi is the initial velocity

t is the time taken

Suppose an object starts with 20m/s from a point A. When it covers a distance of 100m, then, its velocity is decreased to 10m/s.

This is a case of retardation or decrease in acceleration.

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