A football player (m=115g) is sitting on the ground. A playerkicks the ball with

Question

A football player (m=115g) is sitting on the ground. A playerkicks the ball with a force of 36 N. The force acts over a distanceof 25 cm and is along the direction of motion of the soccerball. A) What is the speed of the ball afrer being kicked? B)When the ball reaches a height of 6.5m , it has a speed of4.2 m/s. How much work does the non-conservative force of airresistance do on the ball? A football player (m=115g) is sitting on the ground. A playerkicks the ball with a force of 36 N. The force acts over a distanceof 25 cm and is along the direction of motion of the soccerball. A) What is the speed of the ball afrer being kicked? B)When the ball reaches a height of 6.5m , it has a speed of4.2 m/s. How much work does the non-conservative force of airresistance do on the ball?

Explanation / Answer

Mass m = 115 g = 0.115 kg

Force F = 36 N

Distance S = 25 cm =0.25 m

(A). Accleration a = F / m= 313.04 m / s ^ 2

Initial speed u = 0

We know from the relation v ^ 2- u ^ 2 = 2aS

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