A carpenter on top of a roof of 20 0m high drop... - JAMB Physics 2011 Question
A carpenter on top of a roof of 20.0m high dropped a hammer of mass 1.5 kg and it fell directly to the ground. the kinetic energy of the hammer just before hitting the ground is?
[g = 10 ms-2]
A
600 J
B
150J
C
300 J
D
450 J
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Correct Option: C
K e just before hitting the gound
= P e at the maximum height (conservation of mechanical energy)
K e = P e = mgh = 1.5 x 10 x 20
= 300 J
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