Question

The leaning tower of Pisa is 45 metre high. A mass of 4kg is dropped from the top. Calculate it's potential energy at top. ​

Answer 1

Answer:

1764 J

Explanation:

P>E = mgh

P.E = 4 x 45 x 9.8

P.E = 1764 J

Answer 2

Answer:

Explanation:

At the top,

P.E=mgh

     = 4 x 9.81 x 45 = 1765.8 J

Before impact,

K.E=P.E

(1/2)m(v^2) = 1569.6

v = sqrt(2 x1765.8 /4)

v=882.9 m/s

v= 883 m/s