A graph of v(t) is shown for a world-class track sprinter in a 100-m race. (See figure below). (a)
What is his average velocity (in m/s) for the first 4 s?
6
m/s
(b)
What is his instantaneous velocity (in m/s) at
t = 8 s?
m/s
(c)
What is his average acceleration (in m/s2) between 0 and 4 s?
m/s2
(d)
What is his time (in s) for the race?
s

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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.

force required to detach it is given by

charges are taken to be fundamental charge

now we have

so above is the minimum distance at which it will detach