Question

what is the speed acquired by an object in free fall 4 s after being dropped from a rest position?
the speed is 80 m/s.
the speed is 4 m/s.
the speed is 40 m/s.
the speed is 2.5 m/s.

Explanation:

Step1: Identify the formula

The formula for the speed \(v\) of an object in free - fall is \(v = gt\), where \(g\) is the acceleration due to gravity (\(g = 10\ m/s^{2}\)) and \(t\) is the time.

Step2: Substitute the values

Given \(t = 4\ s\) and \(g=10\ m/s^{2}\), we substitute into the formula: \(v=10\times4\).

Step3: Calculate the result

\(v = 40\ m/s\).

Answer:

The speed is 40 m/s.