Question

Explain Positive Acceleration

Answer 1

Answer:

acceleration is said to be positive only when the velocity has the same sign as acceleration i.e if velocity is negative then acceleration too should be negative then it is accelerated motion or positive accleration

Answer 2

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✒ 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

✒ Types of Acceleration

☞There is two types of Acceleration

1. Uniform Acceleration

• If the velocity changes in equal amounts in equal time of intervals and the object travels in a straight line than the uniform acceleration take place.

2. Non-uniform Acceleration

• If the velocity changes in an equal amount in unequal intervals of time and object travels in straight line then non uniform acceleration take place.

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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.

✏ Positive Acceleration -

A object is said to be in a positive acceleration when velocity of a body increases then positive acceleration take place.

i.e v>u

✏ Negative Acceleration -

A object is said to be in a 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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✒ 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 m/s²

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