Question

An object weighs 57lb and is suspended 4.4ft from the ground. If it were to free fall, what is its speed just before impact? What is the effective force on impact?

Answer 1

we know the acceleration due to gravity in FPS unit is 32.2 ft/s

we know final velocity ,

here initial velocity u= 0,

or, , or = 16.833 ft/s

this is the speed just before impact.

Effective force on impact = F = ma = 57* 32.2 = 1835.4 pound foot/ second^2