Carlos does a chin-up in gym class and raises himself 0.5 m. If Carlos has a mass of 10 kg, how much work does he accomplish? (Remember, mass is not a force!) (Use 9.8
m/s/s as g)

ill do it for 100, also this isnt 80 its 40

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.

there are no contact forces mentioned on the list of choices that you've provided.

490 n

f=125n a=2.5m/s2