Work Done :: Discussion


2.An athlete in the Olympic game covers a distance of 100m in 10s. His kinetic energy can be estimated in the range?
A.200J – 500J
B.2×105J – 3×105J
C.20000J – 50000J
D.2000J – 5000J
Answer:  Option  D
Explanation:

Average speed of the athlete, v = s/t = 10m/s
Assuming the mass of the athlete to 60kg, his average kinetic energy would be
K = 1/2×60×102
K = 3000J.

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Published by:Michael Daani

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