Ahorse running at 3 m/s speeds up with a constant acceleration of 5 m/s2. how fast is the
horse going when it travels 15.3 m from where it started to accelerate.

The horse is going at 12.72 m/s speed.

Explanation:

The initial speed of the horse (u) = 3 m/s

The acceleration of the horse (a)= 5 m/

The displacement( it is assumed it is moving in a straight line)(s)= 15.3 m

Applying the second equation of motion to find out the time,

Solving this quadratic equation, we get time(t)=1.945 s, the other negative time is neglected.

Now applying first equation of motion, to find out the final velocity,

v=12.72 m/s

The horse travels at a speed of 12.72 m/s after covering the given distance.

the total distance that martina travels that day is

(distance from home to mom's office) plus (distance from mom's office to school)

plus (distance from school to library) plus (distance from library to friend's house)

plus (distance from friend's house to martina's house).

(we don't know what any of these distance actually is.)

watch you tube or play clash royale, mainly clash royale