A) The floor is lubricated
B) It is coated with oil
C) Balls are placed under it
D) It is smoothed with sand paper
Correct Answer: C
Solution :
In order to answer this question successfully, the student must understand that when balls are placed under the plank of wood, it rolls instead of sliding. Hence, its friction is the least and its speed increases the most. The correct answer is C.You need to login to perform this action.
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