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velocity and acceleration

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1) An icecream truck is moving at 20m/s. It then speeds up for 5 seconds at 8m/s. what is its velocity at this time?

2) A rocket in space moves at constant velocity of 9.8m/s then it uses propulsion system to accelerate to 10m/s guring 3min. burndown. What is accelearation of the rocket?

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velocity and acceleration are investigated. The solution is detailed and was rated '5/5' by the student who originally posted the questions.