A boy and his two friends push three toy cars across a smooth floor. Each car is being pushed at the same constant speed. Car
Time of push
Distance of push
A
10 seconds
5 meters
B
5 seconds
2
с
15 seconds
2
Determine the distance cars B and C must travel in order for all cars to go the same speed. (DOK 2. AKS 8a)
O A Cars B and C must travel 5 m since that is how far Car A travelled
O B. Car B must travel 7.5 m and Car C must travel 2.5 m
C Car C must travel 75 m and Car B must travel 2.5 m
D. Car B must travel 20 m and Car C must travel 30 m

As you are trying to move a heavy box of mass m, you realize that it is too heavy for you to lift by yourself. there is no one around to , so you attach an ideal pulley to the box and a massless rope to the ceiling, which you wrap around the pulley. you pull up on the rope to lift the box. use g for the magnitude of the acceleration due to gravity and neglect friction forces. once you have pulled hard enough to start the box moving upward, what is the magnitude f of the upward force you must apply to the rope to start raising the box with constant velocity? express the magnitude of the force in terms of m, the mass of the box.