Dwight uses a spring (k= 70 N/m) on a horizontal surface to make a launcher for model cars. The spring is attached to a holder that has a mass of 0.3 kg. If he compresses the spring and releases it, the launcher will move back and forth in periodic motion.a. He compresses the spring by 0.4 m and lets it go. What is the maximum speed of the launcher?b. He compresses the spring by 0.4 m and lets it go again. What is the speed of the launcher at the point where the spring is compressed exactly 0.2 m?