Question

A $20kg$ ball is thrown upwards with a speed of $6m{s}^{-1}$. Find the maximum height it reaches $(g=9.8m{s}^{-2})$.

• A. $2.86m$
• B. $1.88m$
• C. $3.82m$
• D. $1.84m$

Answer 1

The correct option is D $1.84m$

A $20kg$ ball is thrown upwards with a speed of $6m/s$.

At the maximum height the velocity is zero $v=0$

hence,$v^2=u^2-2gH$

$o=u^2-2g\ast H$

$H=\frac{u^2}{2g}=\frac{6\ast 6}{2\ast 9.8}=1.84m$