Physics

Problem

2\,\text{kg}

block on a smooth horizontal surface is acted upon by a horizontal force that varies with time as

F(t)=5t\,\text{N}

, where

t

is in seconds. If the block starts from rest at

t=0

, its speed after

4\,\text{s}

will be a)

10\,\text{m\,s}^{-1}

20\,\text{m\,s}^{-1}

40\,\text{m\,s}^{-1}

80\,\text{m\,s}^{-1}