1. A children’s roller coaster is released from the top of a track. If its maximum speed at ground level is 3 m/s, find the height it was released from

2. A student uses a spring gun (with a spring constant of 150 N/m) to launch a marble vertically into the air. The mass of the marble is 0.01 kg and the spring is compressed 0.025 m. How high will the marble go?