Question

An arrow fired from a bow attains a maximum height of $5m$ from the level it is released. If the mass of the arrow is $500grams$, work done by the bow on arrow is greater than which of the following? (Assume, $g=10m{s}^{-2}$)

• A. $35J$
• B. $20J$
• C. $10J$
• D. $30J$

Answer 1

Answer: (B), (C)

$10J$

The work done by the bow on arrow would be equal to the maximum gravitational potential energy stored in it, which would be equal to $m\times g\times h$

Given, mass $m=500gm$$=\frac{500}{1000}=0.5kg$, $g=10m{s}^{-1}$ and height $h=5m$

$\therefore m\times g\times h=\frac{500}{1000}\times 10\times 5=25J$