Question

in what situation the velocity time graph is a straight line with negative slope

Answer 1

acceleration is constant and it is retardation

Answer 2

In retarded motion the velocity time graph is a straight line with negative slope

Explanation:

• Negative acceleration is called retardation. If the velocity of a body is decreasing with respect to time, the acceleration is said to be negative.
• Acceleration takes place when the velocity of a body changes. So when the velocity of a body increase, the acceleration is said to be positive and when the velocity of a body decrease, the acceleration is said to be negative(Retardation).A body is said to be retarded if its velocity is decreasing.  
• Eg: a train is said to be retarded when it slows down on reaching a station,i.e. the velocity decreases.Retardation is acceleration with negative sign. Or negative value of acceleration shows that the velocity of a body is decreasing.

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