On may 20, 1999, robbie knievel easily cleared a narrow part of the grand canyon during a world-record–setting long-distance motorcycle jump—69.5m
.he left the jump ramp at a 10∘
angle above the horizontal. how fast was he traveling when he left the ramp? indicate any assumptions you made.

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.

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