A player caught a cricket ball of mass 150 g150 g moving at a speed of 20 m/s20 m/s. If the catching process is completed in 0.1 s0.1 s, the magnitude of force exerted by the ball on the hand of the player is:
Question
A player caught a cricket ball of mass 150 g150 g moving at a speed of 20 m/s20 m/s. If the catching process is completed in 0.1 s0.1 s, the magnitude of force exerted by the ball on the hand of the player is:
Solution
Primero, convertimos la masa de la bola de cricket de gramos a kilogramos:
Luego, utilizamos la segunda ley de Newton, que establece que la fuerza es igual al cambio en el momento (impulso) dividido por el tiempo durante el cual ocurre el cambio:
El momento inicial () de la bola es:
El momento final () de la bola es cero, ya que la bola se detiene:
El cambio en el momento () es:
El tiempo durante el cual ocurre el cambio () es:
Ahora, calculamos la fuerza:
La magnitud de la fuerza es:
Por lo tanto, la magnitud de la fuerza ejercida por la bola en la mano del jugador es:
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