Question

question 10 of 10
a glass falls off a shelf. how fast is the glass moving after 0.4 seconds?
a. 2.1 m/s
b. 3.9 m/s
c. 5.5 m/s
d. 4.1 m/s

Explanation:

Step1: Identify the formula

Use the free - fall velocity formula $v = gt$, where $g$ is the acceleration due to gravity ($g\approx9.8\ m/s^{2}$) and $t$ is the time.

Step2: Substitute the values

Substitute $g = 9.8\ m/s^{2}$ and $t = 0.4\ s$ into the formula: $v=9.8\times0.4$.

Step3: Calculate the result

$v = 3.92\ m/s\approx3.9\ m/s$.

Answer:

B. 3.9 m/s