Select all: Work is equal to...
KE + PE
Change in energy
mg
Fd
Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who did more work?
Bobby
Carol
They did the same amount of work
Not enough information
A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:
320 W
400 W
500 W
2 000 W
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