OnlineCBT
Physics · WORK, ENERGY AND POWER
हिन्दीA constant force \( F \) acts on a block of mass \( 2\text{ kg} \) resting on a frictionless horizontal plane at an angle \( \theta = 60^\circ \) above the horizontal. If the block starts from rest and attains a kinetic energy of \( 72\text{ J} \) after covering a distance of \( 6\text{ m} \), the magnitude of the force \( F \) is:
Correct answer · Option 3
\( 24\text{ N} \)
Explanation
By the work-energy theorem, \( W = \Delta K \implies F d \cos\theta = 72 \implies F(6)(\frac{1}{2}) = 72 \implies 3F = 72 \implies F = 24\text{ N} \).
