Question: 4. (5 points) A 10 kg roller coaster started from rest and moved down a 20 m high curved hill. Assuming the work done

4. (5 points) A 10 kg roller coaster started from rest and moved down a 20 m high curved hill. Assuming the work done by friction force during the process is -750 J. Use conservation of energy to find the final speed of the roller coaster? 5. (5 points) A 600 kg car initially moving at 20 m/s hit a 100 kg deer initially running at 5 m/s in the same direction. What is their final velocity if the deer remains on the car?

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