Question

2. The leaning tower of Pisa is 45 m high. A mass
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

Potential energy = mgh

height = 45 m

g = 9.8 N/m

potential energy = 4 kg× 9.8N/m × 45m

= 1764 kg N/m²

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