Question

A stone of mass $500g$ is thrown vertically upwards with a velocity of $15m{s}^{-1}$. Calculate the total energy as its half way point.

• A. $28.125J$
• B. $5625J$
• C. $56.25J$
• D. $2812.5J$

Answer 1

The correct option is C $56.25J$

Given $m=0.5kg;v=15m/s$
$K.E=0.5m{v}^2$
$K.E=0.5\times 0.5\times 15\times 15=56.25J$
This will be the kinetic energy when it is on the ground at which P.E is zero. Hence this is the total energy.

As energy is conserved at every point even at half-way point total energy would be $56.25J$.