A student answers that speed is a vector. Is he right ? Why?
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The student is wrong because sound is itself neither scalar nor vector quantity, speed of sound is scalar quantity.

Explanation:

i believie he's wrong

Explanation:

since speed is a scalar quantity rather than a vector  In addition, speed only represents the amount of distance travelled in a given length of time, and distance is never negative. However, because velocity is a vector quantity, it can imply either a positive or negative direction on a plane.

multiply 2kg by latent heat of vap

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.