A 98 newton sack of grain is hoisted to a storage room 50 meters above the ground floor of a grain elevator.
What is the icrease in potential energy of the sack of grain at this height?
The rope being used to lift the sack of grain breaks just as the sack reaches the storage room. What kinetic energy does the sack have just before it strikes the ground floor?
2006-12-03 13:50:43 · 3 answers · asked by josh h 3 in Science & Mathematics ➔ Physics
1) & 2) 4900 Nm
Matt's answer would be right if it was 98 kg AND you had asked for the velocity at impact.
2006-12-03 13:55:08 · answer #1 · answered by Steve 7 · 0⤊ 0⤋
PE = mgh = 98*9.8*50 = 48020 J
KE = .5mv^2
48020 = .5*98*v^2
v=31.3 m/s
2006-12-03 21:55:06 · answer #2 · answered by Modus Operandi 6 · 0⤊ 0⤋
hold on , i think i know
what must come down must come up
v=31.3 m/s!
2006-12-03 21:55:10 · answer #3 · answered by Anonymous · 0⤊ 0⤋