The football of mass 0.4 kg moving with a velocity of 2 m/s was kicked by a player. If its velocity was increased to 8 m/s after kicking, then calculate the work done by the player on the football.

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Q. A player kicks a football of mass

0.5

kg and the football begins to move with a velocity of

10 m / s

. If the contact between the leg and the football lasts for

\frac{1}{50}

sec, then the force acted on the football should be

In the following example, try to identify the number of times the velocity of ball changes:

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