Question

a ball thrown from ground with speed 20 m/s comes back ti the ground with speed 10 m/s . find the work done by air resistance​

Answer 1

Explanation:

Use work energy theorem

$w = \frac{1}{2} m( {v}^{2} - {u}^{2} )$

$w = \frac{1}{2} \times 1 \times ( {20}^{2} - {10}^{2} )$

$w = - 150j$