Question

question 20 of 25 how long does it take a racehorse to accelerate from rest to a speed of 15 m/s with an acceleration of 3.0 m/s²? a. 60 s b. 5.0 s c. 12 s d. 3.0 s

Explanation:

Step1: Identify known quantities

Initial velocity \( u = 0 \, \text{m/s} \), final velocity \( v = 15 \, \text{m/s} \), acceleration \( a = 3.0 \, \text{m/s}^2 \)

Step2: Use kinematic equation \( v = u + at \)

Since \( u = 0 \), equation simplifies to \( t = \frac{v}{a} \)

Step3: Calculate time

\( t = \frac{15}{3.0} = 5.0 \, \text{s} \)

Answer:

B. 5.0 s