Question

define retardation (negative acceleration). give an example of negative acceleration​

Answer 1

Explanation:

when a force is applied to decrease the speed of a body ,then it is called retardation...example: when we apply brakes in car

Answer 2

$\large{\underline{\underline{\blue{\bf{\hookrightarrow Retardation:- }}}}}$

• When the direction of acceleration is opposite to the direction of Velocity , then it called retardation or deacceleration .
• If dirⁿ of Velocity is taken positive , then dirⁿ of acceleration will be negative.
• For ex - We will se here two examples-

1. When brakes are applied to the car , then its speed decreases and finally it comes to rest .
2. When a ball is thrown vertically upwards , its speed gradually decreases and at a height its velocity becomes zero.

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• There are three equⁿs of motion which are

1. v = u + at .
2. s = ut + ½at².
3. 2as = v² - u².

• We can calculate distance travelled in nth second by using the formula ,

1. $\sf{S_n}$=u + ½a(2n - 1) .
2. When a body is projected vertically upwards from ground at a speed v ,and another object is dropped from a tower of height h , then they will meet after time = h / v .