A train that is 268.7 m long undergoes constant acceleration the moment the
last car (end of the train) is outside of the station, how far is the front of the
train from the station after 25.0 s if its initial speed before acceleration is
4.48 m/s and its final speed is 27.4 meters per second?
A 667 m
B 678 m
C 399 m
D 663 m

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.

distance = 150m

displ = root (50 ^2 + 100^2)

root(2500+10000)

root 125000