question 20 of 25 how long does it take a racehorse to accelerate from rest to a speed of 15 m/s with an…

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

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

Answer

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