A block of mass is suspended from a spring balance inside an elevator descending with…

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Force and Translational Dynamics · Force and Translational Dynamics

Problem

A block of mass

10\,\text{kg}

is suspended from a spring balance inside an elevator descending with uniform acceleration

3\,\text{m\,s}^{-2}

. What is the reading of the spring balance? (Take

g = 9.8\,\text{m\,s}^{-2}

.) (a)

128\,\text{N}

(b)

70\,\text{N}

(c)

68\,\text{N}

(d)

98\,\text{N}