A 3200-lb car is moving at 64 ft/s down a 30-degree grade when it runs out of fuel. Find its velocity after that if friction exerts a resistive force with magnitude proportional to the square of the speed with k

The velocity is 40 ft/sec.

Explanation:

Given that,

Force = 3200 lb

Angle = 30°

Speed = 64 ft/s

The resistive force with magnitude proportional to the square of the speed,

Where, k = 1 lb s²/ft²

We need to calculate the velocity

Using balance equation

Put the value into the formula

Put the value of k

At terminal velocity

So,

Hence, The velocity is 40 ft/sec.

32: from largest to smallest, this hierarchy includes eons, eras, periods, epochs, and ages.

33: answer is c

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d. air pressure decreases as altitude increases.