A block of mass \( 5 \mathrm{~kg} \) is resting on a smooth surface. At what angle a force of \(...

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A block of mass \( 5 \mathrm{~kg} \) is resting on a smooth surface. At what angle a force of \( 20 \mathrm{~N} \) be acted on the body so that it will acquired a kinetic energy of \( 40 \mathrm{~J} \) after moving \( 4 \mathrm{~m} \)
[Odisha JEE 2011; Similar Odisha JEE 2012]
(a) \( 30^{\circ} \)
(b) \( 45^{\circ} \)
(c) \( 60^{\circ} \)
(d) \( 120^{\circ} \)
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