Which physical property of iron made it popular for use in
1. magnetism
2. luster
3. malleability
4. ductility

Option (3) is the correct answer.

Explanation:

Iron is a metal and it is known that metals are malleable, that is, they can be drawn into sheet. Also, metals are ductile in nature, that is, they can be changed into thin wires.

Therefore, weapons like sword, ax etc are the weapons which have malleable surface.

Whereas magnetism is a property in which a weapon is attracted by a magnet. Luster is a property which shows shiny surface of a metal.

Therefore, we can conclude that malleability is a physical property of iron which made it popular for use in weapons.

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.

the maxium height is 34m/s