what is best to say about a runner who is running at a constant velocity?\na. their acceleration is…
what is best to say about a runner who is running at a constant velocity?\na. their acceleration is positive.\nb. their acceleration is negative.\nc. their acceleration is zero.\nd. their acceleration cannot be determined.\nplease select the best answer from the choices provided.\na\nb\nc\nd
Answer
Brief Explanations:
Acceleration is defined as the change in velocity over time ((a=\frac{\Delta v}{\Delta t})). When a runner has a constant velocity, the change in velocity ((\Delta v = v_{final}-v_{initial})) is zero. Substituting (\Delta v = 0) into the acceleration formula gives (a = 0).
- Option A: Positive acceleration implies an increase in velocity, which is not the case for constant velocity.
- Option B: Negative acceleration (deceleration) implies a decrease in velocity, which is not the case for constant velocity.
- Option C: As shown by the formula (a=\frac{\Delta v}{\Delta t}) with (\Delta v = 0), acceleration is zero.
- Option D: The acceleration can be determined using the formula for acceleration when velocity is constant.
Answer:
C. Their acceleration is zero.