Question

the velocity time graph of a moving particle is shown in figure . a instantaneous acceleration of the particles is positive at the point .
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Answer 1

Answer:

B

Explanation:

the answers is B as from a to B the velocity increases hence its positive. I. e the velocity at B is greater than the velocity at a whereas all other points re undergoing retardation

Answer 2

The instantaneous acceleration of the particle is positive at the point A.

Given,

A graph representing a curve between the velocity and time of a particle.

To find,

the point at which the instantaneous acceleration of the particle is positive.

Solution:

• Velocity is equal to the rate of distance covered.

• In the same way acceleration is equal to the rate of change of velocity.
• Instantaneous acceleration of a particle is equal to its acceleration at an instant of time.

• It is given by the following expression:
• $(a)inst=\frac{dv}{dt}$.
• The slope of v-t curve gives instantaneous acceleration of a particle.

The slope at the point A is positive.

The slope at the point B is zero.

The slope at the point C is negative.

The slope at the point D is also negative.

Hence, the instantaneous acceleration at point A is positive.

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