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.
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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