A kayaker travels down a river at a speed of 16 m/s [down river] relative to ground, with the current flowing in the same direction. When traveling up the river against the current, the kayaker achieves a speed of 6 m/s [up river] relative to ground. What is the speed of the swimmer in still water? a) 6 m/s b) 24 m/s c) 16 m/s d) 10 m/s e) None of the above
7. A kayaker travels down a river at a speed of 16 m/s [down river] relative to ground, with the current flowing in the same direction. When traveling up the river against the current, the kayaker achieves a speed of 6 m/s [up river] relative to ground. What is the speed of the swimmer in still water?
a) 6 m/s
b) 24 m/s
c) 16 m/s
d) 10 m/s
e) None of the above
8. A boat always points directly at the opposite shore while crossing a river. The time it will take to cross will be
a) less if the current is stronger
b) greater if the current is stronger
c) the same regardless of the current
d) dependent on the strength of the current
e) impossible to predict without more information
9. A bicyclist moving at 12 m/s passes a runner at rest. The runner chases the bicyclist with an acceleration of 1.5 m/s 2 . How much time passes before the distance between the runner and the bicyclist starts to decrease?
a) 16s
b) 4.0s
c) 8.0s
d) The distance between them will remain constant
e) The distance between them will always grow
10. Which of the following angles (above the horizontal) would achieve the greatest range when launching a projectile from an elevated position?
a) 0 degrees
b) 15 degrees
c) 40 degrees
d) 80 degrees
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