Question: 3 . A roller coaster starts from rest at a height of 3 0 m above the ground. It descends a steep track and rises

3. A roller coaster starts from rest at a height of 30 m above the ground. It descends a steep track and rises again to a height of 10 m. Assuming no energy is lost due to friction, find the speed of the roller coaster at the lowest point. Calculate its speed when it rises back to the 10 m height. (Use g =9.8 m/s2).

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