Concepts Of Physics MCQ Edition [Volume 1]
- Exam
- Concepts Of Physics MCQ Edition [Volume 1]
- Subject
- Physics
- Chapter
- Rest and Motion Kinematics
Concepts Of Physics MCQ Edition [Volume 1] · Physics · Rest and Motion Kinematics
At t = 0 , the velocity of a particle is zero. Which of the...
At , the velocity of a particle is zero. Which of the following statements are correct?
Options
- AThe acceleration may be zero at .
- BIf the speed is zero from to , then the acceleration is also zero during this interval.
- CIf the acceleration is zero from to , then the speed is also zero during this interval.
- DThe acceleration must be zero at .
Correct answer
C. If the acceleration is zero from to , then the speed is also zero during this interval.
Step-by-step solution
At , .
For the first statement, the acceleration may or may not be zero. For example, a particle at its highest point in vertical motion has but . If a particle is permanently at rest, and . Thus, acceleration may be zero, making the first statement correct.
For the second statement, if speed is zero from to , the velocity is constant and equal to zero. Therefore, , making the second statement correct.
For the third statement, if acceleration is zero from to , the velocity is constant. Since at , the velocity remains zero throughout the interval, meaning the speed is zero. The third statement is correct.
For the fourth statement, as shown previously, acceleration does not have to be zero when . The fourth statement is incorrect.
For the first statement, the acceleration may or may not be zero. For example, a particle at its highest point in vertical motion has but . If a particle is permanently at rest, and . Thus, acceleration may be zero, making the first statement correct.
For the second statement, if speed is zero from to , the velocity is constant and equal to zero. Therefore, , making the second statement correct.
For the third statement, if acceleration is zero from to , the velocity is constant. Since at , the velocity remains zero throughout the interval, meaning the speed is zero. The third statement is correct.
For the fourth statement, as shown previously, acceleration does not have to be zero when . The fourth statement is incorrect.