SOLUTION: A 5kg block of ice falls away from the roof of a block of flats, at a height of 26m above the ground. a) find out how long it takes for the ice block to hit the ground. b) what

Algebra ->  Test -> SOLUTION: A 5kg block of ice falls away from the roof of a block of flats, at a height of 26m above the ground. a) find out how long it takes for the ice block to hit the ground. b) what       Log On


   

Question 402308: A 5kg block of ice falls away from the roof of a block of flats, at a height of 26m above the ground.
a) find out how long it takes for the ice block to hit the ground.
b) what is the speed at which the ice block hits the ground.
c) how much energy it transfers to the surroundings when it comes to a stop
(g=9.8)
I have tried and found: a) t=2.3s b) v=22.54m/s but the last part i'm lost!
Answer by Earlsdon(6294) About Me  (Show Source):
You can put this solution on YOUR website!
I have the same answers for parts a) and b)
Energy (E) is given by:
E+=+%281%2F2%29mv%5E2 where m = the mass of the object and v = its velocity.
You have correctly calculated v = 22.54 m/sec and m is given as m = 5kg, so we substitute to get:
E+=+%281%2F2%295%2822.54%29%5E2kg-m%5E2%2Fsec%5E2
E+=+2.5%28508.05%29
E+=+1270.125 Joules
Since:
1 kg-m%5E2%2Fsec%5E2 = 1 Joule or 1 Newton-meter.