What is the root mean square value of the following velocity components: 2.0 m/s, -3.0 m/s, and 4.0 m/s?
A)
5.4 m/s
B)
1.9 m/s
C)
3.1 m/s
D)
3.3 m/s
E)
1.0 m/s
Question 2
A swimmer heading directly across a river 200 m wide reaches the opposite bank in 6 min 40 s. She is swept downstream 480 m. What is the speed of the current?
A)
0.50 m/s
B)
0.80 m/s
C)
1.2 m/s
D)
1.4 m/s
E)
1.8 m/s