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  4. A body of mass 5 kg is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure :

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Q. A body of mass $5\, kg$ is suspended by a spring balance on an inclined plane as shown in figure. The spring balance measure :Physics Question Image

BITSATBITSAT 2006

Solution:

Acceleration of the body down the rough inclined plane $=g \sin \theta$
Force applied on spring balance
$=mg \sin \theta$
$=5 \times 10 \times \sin 30^{\circ} $
$=5 \times 10 \times \frac{1}{2}=25\, N$