Question

The elevators in the Landmark Tower in Yokohama, Japan are among the fastest in the world. After starting from rest, they reach a maximum speed of 120 meters per minute. It takes the elevator 4.0 seconds to reach maximum speed. What is its acceleration in m/s/s (meters per second per second)?

Answer 1

Answer:

The acceleration is 30 m/s²

Explanation:

Given that,

Maximum speed = 120 m/s

Time = 4.0 sec

We need to calculate the acceleration

Using equation of motion

$v=u+at$

Where, v = speed

u = initial speed

a = acceleration

t = time

Put the value into the formula

$120=0+a\times4.0$

$a=\dfrac{120}{4.0}$

$a=30\ m/s^2$

Hence, The acceleration is 30 m/s²