Two vehicles with masses 1500 kg and 3000 kg ,respectively, are moving in the same direction and with the same speed on a highway. Both drivers apply their brakes at the same time and both vehicles begin sliding. If the coefficient of kinetic friction is the same for both vehicles, which vehicle stops first?
A. The 1500 kg vehicle
B. The 3000 kg vehicle
C. Both vehicles stop at the same time
D. More information is needed to answer this question.
2. If a 40-kg child lifts a chair from the floor unto a table whose top is 1 meter above the floor, and a 70-kg adult lifts the same chair onto the same table, who does more work?
A. The child
B. The adult
C. They both do the same work.
D. More information is needed to answer this question.
Answers: 1. C 2. C
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