# Assume that you weigh 500 N. If you are falling down through the air at constant speed, the force of the air against your body is a) zero b) more than 0 but less than 500 N c) 500 N d) more than 500 N e) need more information Explain with thorough reasoning.

Assume that you weigh 500 N. If you are falling down through the air at constant speed, the force of the air against your body is
a) zero
b) more than 0 but less than 500 N
c) 500 N
d) more than 500 N
Explain with thorough reasoning.
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Arthur Gillespie
Step 1
According to the Newton's first law of motion,
A body continues in its state of rest, or in uniform motion in a straight line, unless acted upon by a force.
Step 2
Assuming I weigh 500 N, I experience a downward gravitational force OAof 500 N.
If am falling down through the air at constant speed, then according to the Newton's first law of motion the net vertical force acting on me is zero. Therefore a force of the air of equal magnitude as the gravitational force (i.e. 500 N) is acting against body in opposite to the gravitational force.