An object of mass 2 lb is dropped from a height of 100 ft above the ground. Calculate the velocity of the object when hitting the ground. It is assumed that the air-resistance is proportional to the square of the velocity, drag constant is 4, and absolute value of the gravitational acceleration is 32 ft/sec².
(a) 4ā(1 + eā“ā°) ft/sec.
(b) 4ā(1 + eā»ā“ā°) ft/sec.
(c) 4ā(1 + eā“ā°ā°) ft/sec.
(d) 4ā(1 + eā»ā“ā°ā°) ft/sec.