waec model questions vol1 2019 physics
Objective • Question 7
Question 7
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A 5.0 kg block is lifted by a system consisting of a fixed pulley and a movable pulley (ideal, massless and frictionless). The system works with an overall efficiency of 80 %. What minimum pulling force must be applied to raise the block at constant speed?
Answer Options
A.
35.0
B.
40.0
Correct Answer
C.
30.6
D.
25.0
Correct Answer
C
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