Question

1. the elevators in the landmark tower, in yokohama, japan are among the fastest in the world. they accelerate upward at 3.125 m/s² for 4.0 s to reach their final speed. if these elevators start from rest, what is their final speed?

Explanation:

Step1: Recall kinematic velocity formula

$v_f = v_i + at$

Step2: Identify given values

$v_i = 0\ \text{m/s}$, $a = 3.125\ \text{m/s}^2$, $t = 4.0\ \text{s}$

Step3: Substitute values into formula

$v_f = 0 + (3.125)(4.0)$

Step4: Calculate final speed

$v_f = 12.5\ \text{m/s}$

Answer:

$12.5\ \text{m/s}$