Please kindly help answer these 2 1. A weight of 64 lb stretches a spring 3 ft. The weight is pulled down 3 ft below the equilibrium position and then released. What initial velocity vo given to the weight would have the effect of doubling theamplitude of the vibration? Use g = 32 f/sec?

50 A 20-lb weight is suspended by a spring that is stretched 2 inches by the weight. Assume a resistance whose magnitude is times the instantaneous velocity in feet per second. If the weight is pulled Vg down 4 inches below its equilibrium position and released, find the time required to reach the equilibrium position for the first time. The weight reaches the equilibrium position for the first time seconds after it is released. (Do not round until the final answer. Then round to the nearest thousandth as needed.)