1. Two trains, A and B, are on separate, parallel tracks. Initially, train B is beside train A and passing it. The graph describes their motions Using the graph, answer the following questions: (a) At t : 0.40 h, which train is ahead, and by how much? (b) What is the average velocity of train A during the rst 36 min? (c) What is the instantaneous acceleration of train B at t = 0.30 h? (d) What is the average acceleration of train A from r = 0.40 h to z'= 0.70 h? (e) Draw position-time and acceleration-time graphs for both train A and B. vaun/h) 60 SH 4|] 3|] 2|] 1|] mu Ill 0.2 [13 [L4 [LS Il 0.7 US 2. A 70 m wide river ows at 0.80 m/s. A girl swims across it at 1.4 m/s relative to the water. a. What is the least time she requires to cross the river? 1:. How far downstream will she be when she lands on the opposite shore? c, At what angle to the shore would she have to aim, in order to arrive at a point directly opposite the starting point? d. How long would the trip in part (0) take? 3. A medieval prince trapped in a castle wraps a message around a rock and \"gifts; throws it from the top of the castle wall "V with an initial velocity of 25.0 m/s [42 above the horizontal]. meal The rock lands just on the far side of the castle's moat, at a level 9.5 m below the initial level. Determine the rock's (a) time of ight (b) width of the moat (c) velocity at impact ' 9.5m