2.08

5 of 10

A horse canters away from its trainer in a straight line, moving 40 m

m

away in 8.8 s

s

. It then turns abruptly and gallops halfway back in 1.6 s

s

.

Calculate its average speed in meters per second

Answer:

5.77 m/s

Explanation:

Speed = Distance/Time

Distance = 40 + half of 40 = 40+20 = 60 m

Time = 8.8+1.6=10.4 s

Average speed = 60/10.4=5.769230769 m/s

Approximately, the average speed is 5.77 m/s