While standing in a low tunnel, you raise your arms and push against the ceiling with a force of 100 N. Your mass is 70 kg.
a. What force does the ceiling exert on you?
A. 10 N
B. 100 N
C. 690 N
D. 790 N
E. 980 N
b. What force does the floor exert on you?
A. 10 N
B. 100 N
C. 690 N
D. 790 N
E. 980 N
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