(C) Observer $B$ is standing on the block,which means observer $B$ is in a non-inertial frame of reference.In the frame of the block,the block itself

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kinetic energy of the block is zero

(C) Observer $B$ is standing on the block,which means observer $B$ is in a non-inertial frame of reference.In the frame of the block,the block itself is always at rest. Therefore,the velocity of the block with respect to observer $B$ is always zero.Since the velocity is zero,the kinetic energy of the block with respect to observer $B$ is also zero $(K.E. = \frac{1}{2} m v_{rel}^2 = 0)$.Thus,options $A$ and $B$ are incorrect because they describe motion relative to the ground,not relative to the block. Option $C$ is correct because the block is stationary in the frame of reference of observer $B$.

Class 11 Physics Newton's Laws of Motion and Friction Apparent weight and Pseudo Force

Medium

$A$ block of mass $m$ moving with a velocity $v_0$ on a smooth horizontal surface strikes and compresses a spring of stiffness $k$ until the mass comes to rest,as shown in the figure. This phenomenon is observed by two observers:
$A$: standing on the horizontal surface
$B$: standing on the block
To an observer $B$,when the block is compressing the spring:

A
velocity of the block is decreasing
B
retardation of the block is increasing
C
kinetic energy of the block is zero
D
all the above

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Newton's Laws of Motion and Friction

Subtopic

Apparent weight and Pseudo Force

$A$ mass is hanging on a spring balance which is kept in a lift. The lift ascends. The spring balance will show in its reading

Easy

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$A$ wire is bent into the shape of a parabola given by $Y = Kx^2$. $A$ bead of mass $m$ is placed on the wire,which can slide on it without friction. Initially,when the wire is at rest,the bead is at the lowest point of the parabola. If the wire is now moved with a constant acceleration $a$ parallel to the $X$-axis,what will be the distance of the new equilibrium position of the bead from the $Y$-axis,such that it remains stationary relative to the wire?

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$A$ body of mass $1.0 \, kg$ is falling with an acceleration of $10 \, m/s^2$. Its apparent weight will be ......... $kg \, wt$ $(g = 10 \, m/s^2)$.

Easy

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If a trolley accelerates horizontally with acceleration $a$,then the bob is displaced backward from its initial vertical position. The angular deflection of the bob in equilibrium is ..........

Medium

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In the figure shown,$P$ is a plate on which a wedge $B$ is placed,and on $B$ a block $A$ of mass $m$ is placed. The plate is suddenly removed and the system of $B$ and $A$ is allowed to fall under gravity. Neglecting any force due to air on $A$ and $B$,the normal force on $A$ due to $B$ is

Medium

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$A$ mass is hanging on a spring balance which is kept in a lift. The lift ascends. The spring balance will show in its reading

$A$ body of mass $1.0 \, kg$ is falling with an acceleration of $10 \, m/s^2$. Its apparent weight will be ......... $kg \, wt$ $(g = 10 \, m/s^2)$.

If a trolley accelerates horizontally with acceleration $a$,then the bob is displaced backward from its initial vertical position. The angular deflection of the bob in equilibrium is ..........

In the figure shown,$P$ is a plate on which a wedge $B$ is placed,and on $B$ a block $A$ of mass $m$ is placed. The plate is suddenly removed and the system of $B$ and $A$ is allowed to fall under gravity. Neglecting any force due to air on $A$ and $B$,the normal force on $A$ due to $B$ is

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