Answer:B . D . 800 w
Step-by-step explanation:
did 800 J of work in 20 seconds. The couch weighed 500
If the order of the selection is
important we will apply the
Arrangements formula

.
In our case we will have
It would be 60 dgrees since half of 1/3 is 1/6 and a circle is 360 degrees so do 360/6 to get 60 degrees.
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