Question

before you press play what was the velocity/speed? (should be the same as last time) 0 m/s 1 m/s 1 n 0 n keep an eye on the speed. once you hit play, count in your head (or out loud) (or use a stopwatch) how many seconds it takes for the speed to reach 40.0 m/s. hit play. how long did it take? (itll take a while) 80 seconds 90 seconds 40 seconds 1 minute

Explanation:

Step1: Identify velocity before play

Before pressing play, an object is at rest, so its velocity is 0 m/s. The units N are for force, not velocity, so we can eliminate the 1 N and 0 N options.

Step2: Analyze second - part time question

Without any information about acceleration, we assume a constant acceleration situation. If we assume a constant acceleration \(a\), and using the formula \(v = v_0+at\) (where \(v_0 = 0\)), if we assume a typical acceleration value for such a problem - say \(a = 0.5\ m/s^2\), then \(t=\frac{v - v_0}{a}=\frac{40 - 0}{0.5}=80\ s\).

Answer:

First question: A. 0 m/s
Second question: A. 80 seconds