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Question
Complete a sentence and explain it.
Deceleration is ______ acceleration.
Solution
Deceleration is negative acceleration.
Explanation:
When the speed of an object decreases over a period of time, it is said to have a negative acceleration. The final velocity of the object is less than the initial velocity. i.e., v < u, according to the formula,
The acceleration, a = `("v" - "u")/"t"` becomes negative.
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RELATED QUESTIONS
Match the first column with appropriate entries in the second and third columns and remake the table.
| S.No. | Column 1 | Column 2 | Column 3 |
| 1 | Negative acceleration | The velocity of the object remains constant. | A car, initially at rest reaches a velocity of 50 km/hr in 10 seconds. |
| 2 | Positive acceleration | The velocity of the object decreases. | A vehicle is moving with a velocity of 25 m/s. |
| 3 | Zero acceleration | The velocity of the object increases. | A vehicle moving with the velocity of 10 m/s, stops after 5 seconds. |
When the velocity of a body increases with time, its acceleration is ______.
The acceleration of a body moving with uniform velocity is ______.
Give one example of uniform acceleration.
Give one example for non-uniform acceleration.
Give an example for retardation or declaration.
Define the following:
positive acceleration
Define the following:
negative acceleration.
