Physics

Problem

A proton moves along

x

-axis according to the equation

t=\sqrt{\frac{x-50t}{10}}

, where

x

is in metre and

t

is in second. The average velocity in

\text{ms}^{-1}

of the proton during the first 3.0 sec of its motion 1) 40 m/s 2) 80 m/s 3) 120 m/s 4) 140 m/s 1) 40 m/s 2) 80 m/s 3) 120 m/s 4) 140 m/s