a track covers 40m in 8.5ssc while smoothly slowing down to afunal speed of2.8m/s. find it's original speed and it's acceleration​

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

no. bullets are macro objects. wave nature is for light waves, extremely tiny particles. if a light particle was the size of your finger, the bullet would be the size of the universe. so basically, that huge difference in size makes the wave nature of matter insignificant.