(D) When a body reverses its direction, it comes to rest for a moment, for example, a body thrown upward at the topmost point. Hence, the reason state

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Assertion is false but Reason is true

(D) When a body reverses its direction, it comes to rest for a moment, for example, a body thrown upward at the topmost point. Hence, the reason statement is correct.In the same example, at the topmost point, the velocity of the particle is $0$, but the acceleration of the particle is equal to the acceleration due to gravity $(g = 9.8 \ m/s^2)$, which is non-zero.Therefore, the assertion statement is false.

Class 11 Physics Motion in a Straight Line Motion Under Gravity

Medium

Assertion: The zero velocity of a particle at any instant always implies zero acceleration at that instant.
Reason: $A$ body is momentarily at rest when it reverses its direction of motion.
The correct option among the following is:

TS EAMCET 2022 All TS EAMCET

A
Assertion is true, Reason is true and Reason is the correct explanation for Assertion
B
Assertion is true, Reason is true but Reason is not the correct explanation for Assertion
C
Assertion is true but Reason is false
D
Assertion is false but Reason is true

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MediumAIIMS 2011

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$A$ boy is standing on top of a tower of height $85 \, m$ and throws a ball in the vertically upward direction with a certain speed. If $5.25 \, s$ later he hears the ball hitting the ground,then the speed with which the boy threw the ball is .......... $m/s$ (take $g = 10 \, m/s^2$ and speed of sound in air $= 340 \, m/s$).

DifficultKVPY 2015

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The initial and final velocities of a body projected vertically from the ground are $20 \,ms^{-1}$ and $18 \,ms^{-1}$ respectively. The maximum height reached by the body is (Acceleration due to gravity $= 10 \,ms^{-2}$) (in $\,m$)

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Assertion: The zero velocity of a particle at any instant always implies zero acceleration at that instant.Reason: $A$ body is momentarily at rest when it reverses its direction of motion.The correct option among the following is:

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$A$ ball is thrown upwards. Its height varies with time as shown in the graph. If the acceleration due to gravity is $g = 7.5\, m/s^2$,then the height $h$ is.........$m$.

$A$ ball is projected vertically upward with an initial velocity of $50 \; ms^{-1}$ at $t = 0 \; s$. At $t = 2 \; s$,another ball is projected vertically upward with the same velocity. At $t = \dots \; s$,the second ball will meet the first ball $(g = 10 \; ms^{-2})$.

The initial and final velocities of a body projected vertically from the ground are $20 \,ms^{-1}$ and $18 \,ms^{-1}$ respectively. The maximum height reached by the body is (Acceleration due to gravity $= 10 \,ms^{-2}$) (in $\,m$)

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Assertion: The zero velocity of a particle at any instant always implies zero acceleration at that instant.
Reason: $A$ body is momentarily at rest when it reverses its direction of motion.
The correct option among the following is: