A proton moves along -axis according to the equation

PHYSICS · Single correct · CBSE · Physics · Motion · Motion

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