A boat travels due east at a speed 40ms\(^{-1}\)s across a river flow due south at 30ms\(^{-1}\)s. What is the resultant speed of the boat?
A
1.3ms-1
B
10.0ms-1
C
50.0ms-1
D
70.0ms-1
Verified Correct Answer: C.
Physical Principles & Numerical Solution
R\(^2\) = 40\(^2\) + 30\(^2\)
= 1600 + 900 = 2500
R = \(\sqrt{2500}\) = 50m/s
Source: Myschool Past Questions Archive (Record #27859)