A block of mass is kept on the ground

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

Problem

A block

A

of mass

4\,\mathrm{kg}

is kept on the ground. The coefficient of friction between the block and the ground is

0.8

. An external force of magnitude

30\,\mathrm{N}

is applied parallel to the ground. The resultant force exerted by the ground on the block is, where

g=10\,\mathrm{m\,s^{-2}}

, (1)

40\,\mathrm{N}

(2)

30\,\mathrm{N}

(3) Zero (4)

50\,\mathrm{N}