Independent practice C.
7. Calculate the density p (in kg/m?) for each of the following:
a. m = 10 kg and V = 10 m3
b. m = 160 kg and V = 0.1 m3
m = 220 kg and V = 0.02 m3
2. A wooden post has a volume of 0.025 m’ and a mass of 20 kg. Calculate its
density in kg/m².
3. Challenge: A rectangular concrete slab is 0.80 m long, 0.60 m wide and 0.04
m thick
a. Calculate its volume in m.
b. The mass of the concrete slab is 180 kg. Calculate its density in kg/m3

your answer would be fusion

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.