6. A cannon fires a ball upward at 60m/s. How fast will this ball be moving after 4s? A. -60m/s
B. Om/s
C. 40m/s
D. 20.8m/s

The graph below represents the work done by a student while running up flights of stairs. determine the student's power output after 10 seconds: 1600 j/s 8000 j/s 160 j/s 800 j/s

If steel is more dense that lake water, why can a boat float

Hydrogen and helium are both members of?