Question

I know that acceleration is negative when the object is slowing down or the direction changes (i.e. goes backwards). But what if the object is both slowing down and going backwards?

Answer 1

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Answer 2

Direction of acceleration depends upon the sign convention we choose. For example, If the motion is in positive x direction and the acceleration is towards negative x direction then acceleration will be negative.

Answer 3

What if the motion is in negative x direction and the direction is towards negative x direction? Then the motion will be positive, right?

Answer 4

you mean when motion is towards negative x direction and acceleration is towards positive x direction ?

Answer 5

No, what if they are both negative?

Answer 6

Then u'll take the sign of both as negative. For example let's assume the condition of free fall under gravity and take downwards as negative. Then sign of both V and a will be -ve

Answer 7

Thanks

Answer 8

Remember deceleration or retardation is nothing but acceleration in opp direction. This is the reason why we take it as negative.

Answer 9

"Remember deceleration or retardation is nothing but acceleration in opp direction OF THE VELOCITY . This is the reason why we take it as negative." :)