Fact 1: Hitting an object causes the particles in that object to vibrate. Fact 2: Electrical particles in materials vibrate and accelerate. Given the two facts above, doing what to an object causes particles in it to accelerate?

Select from:
i. holding it
ii. heating liquids
iii. Temperature
iv. wanting it
v. heat energy
vi. hitting it
vii. electricity
viii. having it
The answer is:
vi.