Question

18. A boat is able to move through still water at 20 m/s. It makes a round trip to a town 3.0 km upstream. If the river flows at 5 m/s, the time required for this round trip is: A)120s B) 150 s C)200 s D) 300 s E) 320 s 19. A toy racing car moves with constant speed around the circle shown below. When it is at point A its coordinates arex 0,y 3m and its velocity is (6 m/s)t. When it is at point B its velocity and acceleration are: yl A) -(6 m/s)) and (12 m/s')t, respectively B) (6 m/s) and -(12 m/s')t, respectively C) (6 m/s) and (12 m/s')t, respectively D) (6 m/s)t and (12 m/s')j, respectively E) (6 m/s)f and 0 m/s', respectively 20. A bullet shot horizontally from a gun (Ignore air friction): A) strikes the ground much later than one dropped vertically from the same point at the same instant B) never strikes the ground C) strikes the ground at the same time as one dropped vertically from the same point at the same instant D) travels in a straight line B) strikes the ground much sooner than one dropped from the same point at the same instant

Answer 1