PHYSICS PROBLEMS - AVERAGE VELOCITY AND DISPLACEMENT
The fastest fish, the sailfish, can swim 1.2 × 10 2 km/h. Suppose you have a friend who lives on an island 16 km away from the shore. If you send a message using a sailfish as a messenger, how long will it take for the message to reach your friend? G i v e n : v a v g = 1.2 × 10 2 km/h ∆x = 16 km Unknown : ∆t = ? Use the definition of average speed to find ∆t v a v g = ∆ x ∆ t Rearrange the equation to calculate ∆t ∆ t = ∆ x v a v g ∆ t = 16 k m ( 1.2 x 10 2 km h ) ( 1 h 60 m i n ) = 16 k m 2.0 k m/ m i n = 8.0 m i n So the answer is 8.0 min -----------------------------------------------------------------------------------------------------