NOTE: This is a multi-part question. Once an answer is submitted, you will be unable to return to this part. A projectile enters a resisting medium at x = 0 with an initial velocity vo = 935 ft/s and travels 7.5 in. before coming to rest. Assume that the velocity of the projectile is defined by the relation v=vo - kx, where vis expressed in ft/s and x is in feet. Determine the time required for the projectile to penetrate 3.9 in. into the resisting medium. The time required is x 4.9 10-3 s.