14 Four forces act as shown in fig. 1.22. Calculate their resultant.
12 N
10 N
40°
30°
60°
9N
15 N

This is what i found on google “according to the collision theory, the following criteria must be met in order for a chemical reaction to occur: molecules must collide with sufficient energy, known as the activation energy, so that chemical bonds can break. molecules must collide with the proper orientation.” i hope this information you.

Depotion can i think

That would be kinetic energy

The correct answer is  "c".  it is "c" because melting is an endothermic change, and endothermic get's energy from surroundings.