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Answer to Question #51375 in Mechanics | Relativity for ji min lee

Question #51375
In an arcade video game, a spot is programmed to move across the screen according to x = 8.79t - 0.658t^3, where x is the distance in centimeters measured from the left edge of the screen and t is time in seconds. When the spot reaches a screen edge, either at x = 0 or x = 15.0 cm, t is reset to 0 and the spot starts moving again according to x(t). (a) At what time after starting is the spot instantaneously at rest? (b) At what value of x does this occur? (c) What is the spot's acceleration when this occurs? (d) At what time t > 0 does the spot first reach an edge of the screen?
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