A swimmer is able to swim at a speed of 0.85 m/s in still water. (a) How long do
ID: 1586627 • Letter: A
Question
A swimmer is able to swim at a speed of 0.85 m/s in still water. (a) How long does it take the swimmer to go a distance of 1570 m in still water? Call this time t1.t1 =_______s
(b) The swimmer then decides to swim the same distance in a river having a current with a speed of 0.46 m/s. How long does this take if she swims with the current? Call this time t2.
t2 = s
(c) How long does it take her to swim the same distance against the current? Call this time t3.
t3 = s
A swimmer is able to swim at a speed of 0.85 m/s in still water. (a) How long does it take the swimmer to go a distance of 1570 m in still water? Call this time t1.
t1 =_______s
(b) The swimmer then decides to swim the same distance in a river having a current with a speed of 0.46 m/s. How long does this take if she swims with the current? Call this time t2.
t2 = s
(c) How long does it take her to swim the same distance against the current? Call this time t3.
t3 = s
A swimmer is able to swim at a speed of 0.85 m/s in still water. (a) How long does it take the swimmer to go a distance of 1570 m in still water? Call this time t1.
t1 =_______s
(b) The swimmer then decides to swim the same distance in a river having a current with a speed of 0.46 m/s. How long does this take if she swims with the current? Call this time t2.
t2 = s
(c) How long does it take her to swim the same distance against the current? Call this time t3.
t3 = s
A swimmer is able to swim at a speed of 0.85 m/s in still water. (a) How long does it take the swimmer to go a distance of 1570 m in still water? Call this time t1.
t1 =_______s
(b) The swimmer then decides to swim the same distance in a river having a current with a speed of 0.46 m/s. How long does this take if she swims with the current? Call this time t2.
t2 = s
(c) How long does it take her to swim the same distance against the current? Call this time t3.
t3 = s
(a) How long does it take the swimmer to go a distance of 1570 m in still water? Call this time t1.
t1 =_______s
(b) The swimmer then decides to swim the same distance in a river having a current with a speed of 0.46 m/s. How long does this take if she swims with the current? Call this time t2.
t2 = s
(c) How long does it take her to swim the same distance against the current? Call this time t3.
t3 = s
Explanation / Answer
part 1 )
t = distance / velocity
t1 = 1847.059 s
part 2 )
now velocity
v' = v + c = 0.85 + 0.46
t2 = 1570/1.31
t2 = 1198.47 s
part 3 )
v' = 0.85 - 0.46 = .39 m/s
t3 = 1570/0.39 = 4026.64 s
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