I got the first part of this right but my question is for the second part, which I thought was negative but the answer says that is incorrect, maybe I just didn't put it into my webassign correctly.help?

Newtons 3rd law of motion states there is always equal and opposite reaction.

The answer would be a positive value and the same as the first part.

3.38x10^7

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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.