Answer:
1. Light Bulb
2. A switch
3. A battery
4. Ammeter
5. Resistor
6. Voltmeter
A) 1000 kg
Explanation:
vf = vi + at
0 = 20 + (a)(10)
a = -2.0 m/s^2
F = ma
2000 = (m)(2)
m = 1000 kg