1/ Sketch a graph that is a possible description of position as a function of time for for a particle that ms along the x axis and, at t =1s, has (a) zero velocity and positive acceleration; (b) zero velocity and negative acceleration; (d) negative velocity and negative acceleration. (e) For which of these situations is the speed of the particle increasing at t = 1s?
2/ A motorcycle is moving at 30 m/s when the ride applies thee brakes, giving the motorcycle a constant deceleration. During the 3.0 s interval immediately after braking begins, the speed decreases to 15 m/s. What the distance does the motorcycle travel from the instant braking begins until it comes to rest?
3./ (a) If the maximum acceleration that is tolerable for passengers in a subway train is 1.34 m/s^2, and subway stations are located 806 m apart, what is the maximum speed a subway train can attain between stations? (b) What is the travel time between stations? (c) If the subway train stops for 20sat each station, what is the maximum average speed of a subway train, from one start-up to the next?
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