Question

A 0.350kg ball is dropped form a window what is the balls speed after the earth has done 15.0j of work on it

Answer 1

Answer:

9.26 m/s

Explanation:

Energy, in this case kinetic energy is expressed as $KE=0.5mv^{2}$ where m is mass and v is the velocity of the ball. Given that KE js given then making v the subject of the formula $v=\sqrt {\frac {2KE}{m}}$

Substituting KE with 15 J and m with 0.35 kg then

$v=\sqrt {\frac {2\times 15}{0.35}}=9.258200997725476 m/s\pprox 9.26 m/s$