Question

25 Define the term positive acceleration and
negative acceleration​

Answer 1

Answer:

A positive acceleration means an increase in velocity with time. negative acceleration means the speed reduces with time. its a retardation.

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I hope this helps you.........

Answer 2

HEY MATE...!!!✌

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To understand the concept of Positive Acceleration and Negative Acceleration, we need to understand the concept of Acceleration.

➣ Acceleration

• Acceleration is the  rate of change of velocity with time.
• It  is defined as change of velocity of body per unit time.
• SI unit of acceleration is m/s²
• It is Vector Quantity.
• Acceleration = Change in velocity / time

       = Final velocity - Initial velocity / time

       = v - u / t

➣ Positive Acceleration -  

• When velocity of a body increases then positive acceleration take place.
• When an object is speeding up, the acceleration is in the same direction as the velocity.
• i.e v > u

➣ Negative Acceleration -  

• When velocity of a body decreases the negative acceleration take place.
• It is in the opposite direction of velocity.
• i.e v < u

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-: Additional Information :-

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➣ Zero Acceleration -  

• if the change in velocity is zero that is either object is at rest or moving with uniform velocity than zero acceleration will take place.

➣ Example

Problem :-  

A toy car accelerates from 3m/s to 5m/s in 5 s. What is its acceleration?

Answer:

Answer :-

Given: Initial Velocity u = 3m/s,

Final Velocity v = 5m/s,

Time taken t = 5s.

= v - u / t

= 5 - 3 / 5

= 2 /5  

= - 0.4 m/s²

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