arturdo968
Dec 14, 2008, 08:49 AM
melissa fires a spring gun of spring constant 24 N/m that has been compressed 10 cm. A mass of 30 grams (.03kg) was at the end of the spring gun.
a) how fast does the mass leave the gun?(at this point, the spring is no longer compressed)
b) how high does the mass rise?
the answers should be 2.45 m/s and .4m, but I keep getting way off and I've redone it a hundred times, I don't see what can possibly be wrong. Any help?
I have it set up as:
(.5)(.03)(0)^2 + mg(0)+ (.5)(24)(.01)^2=E
E= .0012 J
then I plug that into
E=(.5)(m(v)^2
.0012=.5(.03)(v^2)
v= .28
and that's not right, can anyone see what I'm doing wrong?
a) how fast does the mass leave the gun?(at this point, the spring is no longer compressed)
b) how high does the mass rise?
the answers should be 2.45 m/s and .4m, but I keep getting way off and I've redone it a hundred times, I don't see what can possibly be wrong. Any help?
I have it set up as:
(.5)(.03)(0)^2 + mg(0)+ (.5)(24)(.01)^2=E
E= .0012 J
then I plug that into
E=(.5)(m(v)^2
.0012=.5(.03)(v^2)
v= .28
and that's not right, can anyone see what I'm doing wrong?