(2) Two cars are 150 kilometres apart and travelling toward each other. One car is movng at 60 km/h and the other is moving at 40 km/h. In how many hours will they meet? A) 2.5 h B) 2.0 h C) 1.75 h D) 1.5 h E) 1.25 h 40 156km

(II) Digital bits on a 12.0-cm diameter audio CD are encoded along an outward spiraling path that starts at radius R = 2.5 cm and finishes at radius R, = 5.8 cm. The distance between the centers of neighboring spiral- windings is 1.6 um (= 1.6 × 10-º m). (a) Determine the total length of the spiraling path. [Hint: Imagine "unwinding" the spiral into a straight path of width 1.6 µm, and note that the original spiral and the straight path both occupy the same area.] (b) To read information, a CD player adjusts the rotation of the CD so that the player's readout laser moves along the spiral path at a constant speed of about 1.2 m/s. Estimate the maximum playing time of such a CD.

(i) Height: A ball is kicked up from the ground with an initial velocity of 48 meter per second. The height of the ball from the ground is given by the formula h = -16r + 481, where r is the time in seconds. Find the maximum height reached by the ball. Gi) World Population: The function given by the formula f(x)- 0.000478x- 1.813x + 1720.1 models world population in billions from 1950 to 2025. a) Evaluate f(1985) and interpret the result. b) Estimate the world population today. c) According to tis model, when did the world population reach 7 billion? d) Discuss the implication presented by the difference in your answers in part a and b.