Recent content by lochs

okay i got it =) thank you so much!

Ok so then its PE=gh since mass cancels out? this is what i have KEi=PEi =KEf + PEf becomes 0 + mgh inital = 1/2mv final squared + 0 v final=mgh inital = 2gh initial v final= (2gh inital) 1/2 sorry i hope that makes sense.. I'm not sure how to use the latex thing..

Thank you xanthym, your response is a little confusing.. is that potential energy that you're using? Jameson, i don't get how i'd get a? also would distance be 80 m? and if so isn't that height or are they the same thing?

Thanks =) ok for acceleration i got -73.5 m/sec then i did F=ma F=(0.50 kg)(-74.5 m/sec) F=37.25 N now my question is can you have negative force, cause i got a negative number ..but i didnt think you could have negative force.

[FONT=Arial]I need help with this question as well: If the baseball in example 4.5 is caught by a person whose hand recoils 0.30 m, calculate the average force on the person's hand. (The initial speed of the baseball is 44.7 m/sec and its mass is 0.50 kg.) This is what i have, but I'm not sure...

[FONT=Arial]I have an assignment question, it states: Surprisingly little advantage is gained by getting a running start in a downhill race. To demonstrate this, claculate the final speed of a skier who skis down a hill 80-m-high with negligible friction (a) if her initial speed is zero; (b) if...