Question

Assertion: A body is momentarily at rest when it reverses the direction. Reason: A body cannot have acceleration if its velocity is zero at a given instant of time. (A) $\mathrm{A}$ (B) $\mathrm{B}$ (C) $\mathrm{C}$ (D) D

Name: Problem 183, Chapter 2: A Complete Resource Book in Physics for JEE Main
Uploaded: 2022-02-13T04:10:50-08:00
Duration: 1 min 59 s
Channel: Yuva S
Description: Assertion: A body is momentarily at rest when it reverses the direction. Reason: A body cannot have acceleration if its velocity is zero at a given instant of time. (A) A (B) B (C) C (D) D

   Assertion: A body is momentarily at rest when it reverses the direction.

Reason: A body cannot have acceleration if its velocity is zero at a given instant of time.
(A) $\mathrm{A}$
(B) $\mathrm{B}$
(C) $\mathrm{C}$
(D) D

A Complete Resource Book in Physics for JEE Main

Sanjeev Kumar 1st Edition

Chapter 2, Problem 183

Instant Answer

Solved by Expert Yuva S

02/13/2022

Step 1

This is true because when a body changes its direction of motion, it must first come to a stop before it can start moving in the opposite direction. This can be represented mathematically as follows: Let's assume the body is moving along the positive x-axis with a Show more…

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Assertion: A body is momentarily at rest when it reverses the direction. Reason: A body cannot have acceleration if its velocity is zero at a given instant of time. (A) $\mathrm{A}$ (B) $\mathrm{B}$ (C) $\mathrm{C}$ (D) D

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Key Concepts

Instantaneous Rest

This concept refers to the condition where an object has zero velocity at a specific instant in time. It emphasizes that being momentarily at rest does not imply that the object will remain at rest, but merely that its instantaneous speed is zero.

Acceleration at Zero Velocity

Acceleration, defined as the rate of change of velocity, can be non-zero even when the velocity is zero at a particular moment. This means that an object can have a 'push' or 'pull' acting upon it, leading to movement in a new direction after a momentary pause.

Motion Reversal

Motion reversal describes the scenario in which an object changes the direction of its movement. During this process, the object's velocity becomes zero momentarily before changing sign, while its acceleration plays a crucial role in initiating the change in direction.

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