Question

define acceleration and give its SI unit.when is acceleration of a body negative?give two examples of situations in which acceleration of a body is negative.

Answer 1

Acceleration can be defined as the rate of change of velocity.. It is a vector quantity ..Its SI unit is meter/second^2.
When the velocity of an object decreases,then the object is said to be moving with negative acceleration..
An example of negative acceleration would be a car breaking or decelerating.
A ball thrown vertically upwards is moving with a negative acceleration as the velocity decreases with time..

Answer 2

Answer:

Acceleration is the rate of change in velocity and its SI unit is m/s².

Explanation:

Acceleration is the rate of change in velocity. It is a vector quantity having magnitude as well as direction. Its SI unit is m/s².

The object is said to be moving with negative acceleration when the velocity of an object decreases with respect to time.

Examples of negative acceleration would be a car breaking or decelerating a car and when a ball is thrown vertically upwards, as the velocity decreases with time, it shows a negative acceleration.

Hence, it can be concluded that acceleration is the rate of change in velocity and its SI unit is m/s², and when the velocity decreases with respect to time, it is termed negative acceleration.

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