PH-147

Newton’s laws of motion

Physics · Secondary 3 · Medium · Newton’s laws of motion

A 5.0 kg block is pulled along a rough horizontal surface by a horizontal force of 20 N and moves at constant speed. What is the frictional force acting on the block?

$20\,\text{N}$
$0\,\text{N}$
$5.0\,\text{N}$
$4.0\,\text{N}$

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