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JAMB Physics 1994 Question 3

Question 3

Scalars and Vectors

A boat travels due east at a speed of 40 m s−1 across a river flowing due south at 30 m s−1. What is the resultant speed of the boat?

  1. A.1.3 m s−1
  2. B.10.0 m s−1
  3. C.50.0 m s−1
  4. D.70.0 m s−1
Show the answer and explanation

Answer: C (50.0 m s−1)

Explanation

The two velocities are at right angles: resultant = √(402 + 302) = √2500 = 50.0 m s−1.