A block on a smooth horizontal surface is acted upon by a horizontal force that…

PHYSICS · Single correct · CBSE · Physics · Force and Laws of Motion · Force and Laws of Motion

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}

(b)

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

(c)

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

(d)

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