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3 years ago

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Afootball of mass 550g is at rest on the ground the football is kicked with a force of 108 newton the footballers boot is in con

tact with the ball for 0.3 minute what is the kenitic
energy of the ball

1 answer:

d1i1m1o1n [39]3 years ago

6 0

If "0.3 minute" is correct, then it's 9,543,272 Joules.

If it's supposed to say "0.3 SECOND", then the KE is 2,651 Joules.

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Answer:

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Explanation:

It is given initially angular velocity $\omega =6rev/sec=6\times 2\pi =37.68rad/sec$

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Angular momentum is equal to $L=I\omega =37.68\times 0.4=15.072kgm^2/sec$

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As we know that angular momentum is conserved

So $15.072=I\times 7.85$

$I=1.92kgm^2$

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