8. FORCE AND LAWS OF MOTION
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$1200\, kg$ द्रव्यमान की कार को एक समतल सड़क पर दो व्यक्ति समान वेग से धक्का देते हैं। उसी कार को तीन व्यक्तियों द्वारा धक्का देकर $0.2\, m s ^{-2}$ का त्वरण उत्पन्न किया जाता है। कितने बल के साथ प्रत्येक व्यक्ति कार को धकेल पाते हैं। (मान लें कि सभी व्यक्ति समान पेशीय बल के साथ कार को धक्का देते हैं।)

A

$240$

B

$244$

C

$248$

D

$225$

Solution

Mass of the motor car $= 1200 \,kg$

Only two persons manage to push the car. Hence, the acceleration acquired by the car is given by the third person alone.

Acceleration produced by the car, when it is pushed by the third person,

$a = 0.2\, m/s^2$

Let the force applied by the third person be $ F$.

From Newton's second law of motion:

Force = Mass $\times $ Acceleration

$F = 1200 \times 0.2 = 240 \,N$

Thus, the third person applies a force of magnitude $240\, N$.

Hence, each person applies a force of $240 \,N$ to push the motor car.

Standard 9
Science

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