A car and a truck start from rest at the same instant, with the car initially at some distance behind the truck. The truck has a constant acceleration of 2.10 m/s^2 and the car an acceleration of 3.40 m/s^2. The automobile overtakes the truck after the truck has moved 60.0 mm.

a. How much time does it take the car to overtake the truck?
b. How far was the car behind the truck initially?
c. What is the speed of each when they are abreast?
d. On a single graph, sketch the position of each vehicle as a function of time. Take x = 0 at the initial location of the truck.

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.