Question

Running with an initial velocity of +10.2 m/s m / s , a horse has an average acceleration of -1.77 m/s2 m / s 2 . How much time does it take for the horse to decrease its velocity to +6.1 m/s m / s ?

Answer 1

• Initial velocity=u=10.2m/s
• Final velocity=v=6.1m/s
• Acceleration=-1.77m/s^2=a
• Time=t

Using first equation of kinematics

`\\ \rm{:}\dashrightarrow v=u+at`

`\\ \rm{:}\dashrightarrow v-u=at`

`\\ \rm{:}\dashrightarrow 6.1-10.2=-1.77t`

`\\ \rm{:}\dashrightarrow -4.1=-1.77t`

`\\ \rm{:}\dashrightarrow t=2.32s`