As athlete in the olympic ganes cover a distance of `100 m` in `10 s`. Hiskinetic energy can be estrimated to be in the range

Options

A. ` 200 J - 500 J`
B. `2 xx 10^(5) J - 3 xx 10^(5) J`
C. `20000 J - 50000 J`
D. `20000 J - 50000 J`

Answer

D

Explanation

(d) The average speed of the athelete
`nu= (100)/(10) = 10 m//s :. K.E = (1)/(2) m nu^(2)`
If mass is `40 kg` then , K.E `= (1)/(2) xx 40 xx (10)^(2) = 20000 J `
If is `100 kg` then , K.E `= (1)/(2) xx 100 xx (10)^(2) = 50000 J`