A box on a frictionless horizontal table is simultaneously pulled eastward by a force…

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

Problem

5\,\text{kg}

box on a frictionless horizontal table is simultaneously pulled eastward by a

12\,\text{N}

force and westward by another

12\,\text{N}

force. At the instant the forces begin to act, the box is already sliding northward at

0.40\,\text{m/s}

. What will be the box’s speed and direction after

4.0\,\text{s}

? (a)

0.40\,\text{m/s}

east (b)

0\,\text{m/s}

; the box comes to rest (c)

0.40\,\text{m/s}

north (d)

9.6\,\text{m/s}

east