Specify the velocity of the puck.

Answer: $28\ m/s\ \left(\approx101\ km/h\right)$

Specify the index of refraction of glass.

Specify the density of a body? What material could a body be?

Answer: $8{,}3\ g/{cm}^3 - 8{,}5\ g/{cm}^3$

a) Define the total resistance. b) How high is the resistance with one resistor? The components in the video are standard resistors with the same resistance.

Tip: Series resistors total resistance is equal to the sum of the individual resistances.
Answer: a) $440\ \Omega$, b) $220\ \Omega$