Question

A player kicks a ball of mass 500g placed at the centre of a football ground. The ball leaves his feet with a speed of 4ms-1.Find the work done by the players on the ball.Does it equal to the kinetic energy of the ball as it leaves?

Answer 1

Answer:

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Explanation:

12.5J

Given, initial speed of ball, u=0;

final speed of ball, v=10m/s;

mass of the ball, m=250g=(250/1000)kg

=0.25kg

Work done by the player on the ball,

W=changeinkineticenergy(E

k

)oftheball

or W=

2

1

mv

2

−

2

1

mu

2

=

2

1

(0.25)(10)

2

−

2

1

(0.25)(0)

2

=12.5J

Answer 2

Answer:

Given, initial speed of ball, u=0;

final speed of ball, v=10m/s;

mass of the ball, m=250g=(250/1000)kg

=0.25kg

Work done by the player on the ball,

W=changeinkineticenergy(E

k

)oftheball

or W=

2

1

mv

2

−

2

1

mu

2

=

2

1

(0.25)(10)

2

−

2

1

(0.25)(0)

2

=12.5J

Explanation:

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