I think it’s A, I’m so sorry if I’m wrong.
Given:
The mass of the halfback is m = 107 kg
The speed of the halfback is v = 8 m/s
To find the momentum.
Explanation:
The momentum of the halfback is

Thus, the momentum of the halfback is 856 kg m/s
Explanation:
Below is an attachment containing the solution
Rubber is a insulator so current cannot pass through it where as metal is a conductor which allows current to pass through it
10 mph/s because there is 60 seconds in a minute then divide by 6 which is 10.