Question

when accerlation is negativ?

Answer 1

When the Velocity starts Decreasing, That is u>v.

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Answer 2

negative acceleration is also known as retardation or deacceleration
this is a type of acceleration which slows down the object ONLY if the negative acceleration is greater than the positive acceleration
examples of negative acceleration is when u throw a ball in the sky the speed slows as it is opposed due to the negative acceleration called gravity
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