quinton iversen: a softball is thrown with 150 joules of energy. if the ball is moving at 30.0m/s,what is the mass of the ball in kg
I believe the formula you should use is E
k = (1/2)* mass * (velocity)
2 {where E
k is kinetic energy}
rewriting this gives; mass = 2*E
k/(velocity)
2 2*150/(30^2)
So the answer would be 333 grams.
Reinout
+2353 
