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?

1200N

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 is the final velocity

    u is the initial velocity

    t is the time taken

 Now;

         Force  =  mass x    

Insert the parameters and solve;

      Force  = 120 x  = 1200N

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note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.