Question

A horse and her rider have a combined mass of 120 kg and is traveling 45 m/s down a dirt road. She increases her speed to 85 m/s in 4 seconds., what force did it require for her to speed up?​

Answer 1

1200N

Step-by-step explanation:

Given parameters:

Mass of the horse and rider = 120kg

Initial velocity = 45m/s

Final velocity = 85m/s

Time taken = 4s

Unknown:

Force required to speed up = ?

Solution:

According to Newton's second law of motion;

Force = mass x acceleration

Acceleration =
`(v - u)/(t)`

v is the final velocity

u is the initial velocity

t is the time taken

Now;

Force = mass x
`(v - u)/(t)`

Insert the parameters and solve;

Force = 120 x
`(85 - 45)/(4)` = 1200N