Question

Usain Bolt ran 100 m in 9.58 s, reaching a final speed of 12.43 m/s. What was his acceleration?

Answer 1

1.3m/s²

Step-by-step explanation:

Given parameters:

Distance = 100m

Time taken = 9.58s

Final speed = 12.43m/s

Unknown:

Acceleration = ?

Solution:

Acceleration is the rate of change of velocity with time; to solve this problem, we apply one of the motion equation;

v = u + at

v is the final speed

u is the initial speed

a is the acceleration

t is the time

u = 0m/s

Insert the parameters and solve;

12.43 = 0 + a x 9.58

12.43 = 9.58a

a =
`(12.43)/(9.58)` = 1.3m/s²