Given:
he initial velcicty of the runner is

The final velocity of the runner is

The time taken is t = 2.1 s
The initial velocity of the motorcycle is

The final velocity of the motorcycle is

Required:
Acceleration of the motorcycle.
The difference in distance between runner and motorcycle.
Step-by-step explanation:
cceleration of the runner is

Acceleration of the motorcycle is

The distance travelled by the runner is

The distance travelled by motorcycle is

Thus, the motorcycle travels more distance than the runner.
The
difference between the distance travelled is

Final Answer:
The acceleration of the runner is 1.238 m/s^2
The acceleration of the motorcycle is 3.33 m/s^2
The difference in distance between runner and motorcycle is 82.31 m.