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Q. Having landed on a newly discovered planet, an astronaut sets up a plain pendulum of length 1.17m and finds that it makes 577 complete oscillations in 1590s. The amplitude of the oscillations is very small compared to the pendulum's length.

What is the gravitational acceleration on surface of this planet?

Q. Assume a car's brakes can produce an acceleration of -7 m/s2. If the car is travelling at an initial speed of 28.0m/s, what is the minimum distance necessary to stop car?

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