Two runners start a race. after 2 seconds, they both have the same velocity. if they both started at the same time, how do their average accelerations compare?

let each runner starts from rest

v₀ = initial velocity of each runner = 0 m/s

t = time of travel = 2 sec =

a = average acceleration

average acceleration is given as

a = (v - v₀)/t

inserting the values

a =  (v - 0)/t

a = v/t

since each runner gains equal amount of speed in given time interval of "t". hence the average acceleration of each runner is same.

the answer is d

lies a supermassive black hole called sagittarius a*, or sgr a* for short.