Answer:
B. 4 m/s
Step-by-step explanation:
The formula for Speed is distance per time.
Therefore Speed = Distance / Time
Data
D = 40 m
T = 10 sec
S = ?
Speed = 40m /10sec
To find the speed , divide the distance by the time.
Note : the unit for Speed is meter /second
Speed = 4 m/s
Therefore the speed of the wave, the surfer is riding on is 4 m/s.