What is the mass of a student that weighs 3000n stands on one foot, balancing on a step stool.

Weight = (mass) x (gravity)

so

Mass = (weight) / (gravity)

Mass = (3000N) / (9.8 m/s^2)

Mass = 306.1 kg

But he could never stand on one foot balanced on a step stool. The poor kid weighs 675 pounds ! !

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.