Achild of mass 3m sits on a swing, the base of which has mass m, while the rope (of length l) q34. has a negligible mass. an adult pulls back the swing (with the child) until the rope makes an angle of half-a-radian with the vertical, and, then, pushes with a force mg along the arc of a circle until the rope is exactly vertical and releases it. if the rope was always taut, for how long did the adult push? 20 (а) л 3g 20 (d) 3g (b) 3 g g q49. two tuning forks with natural frequencies v, and v, respectively, are struck at the same time with equal force. the intensity, of the resulting sound, waxes and wanes with time period of 1.5 seconds while the frequency of the sound is 256 hz. hence v, and v, respectively are (a) 256.333 hz and 255.667 hz (b) 256.55 hz and 255.55 hz (d) 256.5 hz and 257 hz (c) 256 hz and 256.5 hz