5.Work, Energy, Power and Collision
medium

સ્પ્રિંગ તેની મૂળ સ્થિતિમાં છે,$0.25 \,kg$ના દળને મુક્ત કરતા તંત્રએ એ સપાટી પર લગાવેલ મહતમ બળ શોધો? ($N$ માં)

A

$15$

B

$20$

C

$25$

D

$30$

(AIIMS-2019)

Solution

The free body diagram of the block of mass $2 kg$ is shown below.

From the work energy theorem,

$W=K E_{2}-K E_{1}$

$m g x=\frac{1}{2} k x^{2}-0$

$kx=2 m g$

$=2 \times 0.25 \times 10$

$=5 N$

Taking the equilibrium of forces in vertical direction,

$N=k x+m g$

$=5+2 \times 10$

$=25 N$

Standard 11
Physics

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