Question

A Navy Seal of mass 80 kg parachuted directly down into an enemy harbor. At one point while she was falling, the resistive force that air exerted on her was 520 N upward. What can you determine about her motion at this point in time

Answer 1

The Navy Seal is accelerating downwards at the rate of 3.3 m/s²

Step-by-step explanation:

Given;

mass of the Navy Seal, m = 80 kg

the upward resistive force on her, F = 520 N

Her net downward force is given by;

`F_(net) = F_(down) - F_(up)\\\\F_(net) = (80*9.8) - 520\\\\F_(net) = 264 \ N`

Her downward acceleration at this time is given by;

F = ma

a = F / m

a = 264 / 80

a = 3.3 m/s²

Therefore, the Navy Seal is accelerating downwards at the rate of 3.3 m/s²