During a trail race, a runner is moving at a velocity of 5 meters per second. He comes to a hill and begins to slow down uniformly for 5 seconds until he is running at 1 meter per second. What is the acceleration of the runner during these 5 seconds?
A
0.2 m/s2
B
-0.2 m/s2
ООО
с
0.8 m/s2
D
0.8 m/s2