Question

2. The leaning tower of Pisa is 45 m high. A mans
of 4 kg is dropped from the top. Calculate its
potential energy at the top.​

Answer 1

H=45m

m=4kg

potential energy (pE)=mgH

P.E=4×9.8×45=1764kgm³/sec²=1764Nm=1764J

Answer 2

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

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