Question

At her most recent track race, Stella had an acceleration of 2.1 m/s2 during the first 3 s of the race. What was her

velocity after 2 s?

Answer 1

Using the kinematic equation for constant acceleration, Stella's velocity after 2 seconds is calculated to be 4.2 m/s.

Step-by-step explanation:

To calculate Stella's velocity after 2 seconds given her acceleration, we can use the kinematic equation v = u + at, where v is the final velocity, u is the initial velocity (which is 0 m/s assuming she starts from rest), a is the acceleration, and t is the time. Plugging in the values:

• u = 0 m/s (since she starts from rest)
• a = 2.1 m/s2
• t = 2 s

We get:

v = 0 m/s + (2.1 m/s2 × 2 s) = 4.2 m/s

Therefore, Stella's velocity after 2 seconds is 4.2 m/s.