7) Will and Bill are in the weightlifting room before soccer practice. Will lifts the 100-pound barbell over his head 10 times in one minute; Bill lifts the 100-pound barbell over his head the same distance as Will, but he raises the barbell 10 times in 10 seconds.

Based on the boys actions, which statement BEST compares their work and power.
A)They do the same amount of work and have the same power.
B)They do the same amount of work, but Bill has more power.
C)Will does more work than Bill; Bill has more power than Will.
D)Bill does more work than Will and he has more power than Will.

8.) How much work is done if a machine exerts 850 watts of power in 30 seconds?
A)28.3J
B)283J
C)2550J
D)25,500J

9.) A construction worker used 450 N to move materials 5 meters in 2 minutes.
A construction worker used 450 N of force to move materials 5 meters in 2 minutes.

How much power did the worker use?
A) 18.75 watts
B) 125 watts
C) 225 watts
D) 1125 watts

10.) Car 1 is parked when it is hit by Car 2. The momentum of Car 2 before the collision was 50 kg m/s. The momentum of Car 1 after the collision is 10 kg m/s. What is the momentum of Car 2 AFTER the collision?
A) 0 kg m/s
B) 10 kg m/s
C) 40 kg m/s
D) 60 kg m/s