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Science Questions need help?

Help! can you please answer these questions or my teacher will kill me and I will have to write a 5 page essay. Question 1: a skater increase her velocity from 2.0 m/s to 10.0 m/s in 3.0 seconds what is the skaters acceleration? Question 2:a parachute on a racing dragster opens and changes the speed of the car from 85 m/s to 45 m/s in a period of 4.5 seconds. What is the acceleration of the dragster? Question 3: a skateboarder traveling at 7.0 meters per second rolls to a stop at the top of a ramp in 3.0 seconds. what is the skateboarders acceleration? Question 4: A family takes a car trip. They travel for an hour at 80k/h and then for 2 hours at 40 km/h. What is their average speed. Question 5: Suppose you ride your bicycle to the library traveling 0.5 km/min. If it takes you 25 minutes to get to the library, how far did you travel? That's all the questions
Answer:

5.

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