Trajectory
Nelka holds a dumbbell in her outstretched hand. She then lifts it by bending her arm only at the elbow through an angle of 135°. The exercise ends with the dumbbell being lowered back along the same path. What is the total length of the trajectory the dumbbell follows if Nelka repeats the exercise 15 times with each hand and her forearm is 30 cm long?
Final Answer:
You need to know the following knowledge to solve this word math problem:
Units of physical quantities
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