(a) A box with its contents has a total mass of 30 kg. It is dropped from a very high building. After reaching terminal speed, what is the magnitude of the air resistance force acting upward on the falling box

The air resistance ,F(air) = 294N

Explanation:

Using Nweton's 2nd Law. The sum of the vertical forces must be equal to zero because when terminal speed is reached,the acceleration becomes zero.

EFvertical = mg - F(air) = ma

F(air) = mg = 30kg × 9.8m/s^2

F(air) = 294N

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answer: 2×10^-2kg

explanation: density= mass per volume

vol=mass/density

converting to s.i units we have;

3÷1000kg = 0.003

1.5÷100m = 0.15

0.003/0.15 = 0.02kg